VictoriaMetrics/app/vmagent

vmagent

vmagent is a tiny but mighty agent which helps you collect metrics from various sources and store them in VictoriaMetrics or any other Prometheus-compatible storage systems that support the remote_write protocol.

Motivation

While VictoriaMetrics provides an efficient solution to store and observe metrics, our users needed something fast and RAM friendly to scrape metrics from Prometheus-compatible exporters into VictoriaMetrics. Also, we found that our user's infrastructure are like snowflakes in that no two are alike. Therefore we decided to add more flexibility to vmagent such as the ability to push metrics instead of pulling them. We did our best and will continue to improve vmagent.

Features

• Can be used as a drop-in replacement for Prometheus for scraping targets such as node_exporter. See Quick Start for details.
• Can add, remove and modify labels (aka tags) via Prometheus relabeling. Can filter data before sending it to remote storage. See these docs for details.
• Accepts data via all ingestion protocols supported by VictoriaMetrics:
  • Influx line protocol via http://<vmagent>:8429/write. See these docs.
  • Graphite plaintext protocol if -graphiteListenAddr command-line flag is set. See these docs.
  • OpenTSDB telnet and http protocols if -opentsdbListenAddr command-line flag is set. See these docs.
  • Prometheus remote write protocol via http://<vmagent>:8429/api/v1/write.
  • JSON lines import protocol via http://<vmagent>:8429/api/v1/import. See these docs.
  • Native data import protocol via http://<vmagent>:8429/api/v1/import/native. See these docs.
  • Data in Prometheus exposition format. See these docs for details.
  • Arbitrary CSV data via http://<vmagent>:8429/api/v1/import/csv. See these docs.
• Can replicate collected metrics simultaneously to multiple remote storage systems.
• Works smoothly in environments with unstable connections to remote storage. If the remote storage is unavailable, the collected metrics are buffered at -remoteWrite.tmpDataPath. The buffered metrics are sent to remote storage as soon as the connection to the remote storage is repaired. The maximum disk usage for the buffer can be limited with -remoteWrite.maxDiskUsagePerURL.
• Uses lower amounts of RAM, CPU, disk IO and network bandwidth compared with Prometheus.
• Scrape targets can be spread among multiple vmagent instances when big number of targets must be scraped. See these docs for details.

Quick Start

Please download vmutils-* archive from releases page, unpack it and configure the following flags to the vmagent binary in order to start scraping Prometheus targets:

• -promscrape.config with the path to Prometheus config file (usually located at /etc/prometheus/prometheus.yml)
• -remoteWrite.url with the remote storage endpoint such as VictoriaMetrics, the -remoteWrite.url argument can be specified multiple times to replicate data concurrently to an arbitrary number of remote storage systems.

Example command line:

/path/to/vmagent -promscrape.config=/path/to/prometheus.yml -remoteWrite.url=https://victoria-metrics-host:8428/api/v1/write

If you only need to collect Influx data, then the following command is sufficient:

/path/to/vmagent -remoteWrite.url=https://victoria-metrics-host:8428/api/v1/write

Then send Influx data to http://vmagent-host:8429. See these docs for more details.

vmagent is also available in docker images.

Pass -help to vmagent in order to see the full list of supported command-line flags with their descriptions.

Configuration update

vmagent should be restarted in order to update config options set via command-line args.

vmagent supports multiple approaches for reloading configs from updated config files such as -promscrape.config, -remoteWrite.relabelConfig and -remoteWrite.urlRelabelConfig:

• Sending SUGHUP signal to vmagent process:

  kill -SIGHUP `pidof vmagent`
  

• Sending HTTP request to http://vmagent:8429/-/reload endpoint.

There is also -promscrape.configCheckInterval command-line option, which can be used for automatic reloading configs from updated -promscrape.config file.

Use cases

IoT and Edge monitoring

vmagent can run and collect metrics in IoT and industrial networks with unreliable or scheduled connections to their remote storage. It buffers the collected data in local files until the connection to remote storage becomes available and then sends the buffered data to the remote storage. It re-tries sending the data to remote storage until any errors are resolved. The maximum buffer size can be limited with -remoteWrite.maxDiskUsagePerURL.

vmagent works on various architectures from the IoT world - 32-bit arm, 64-bit arm, ppc64, 386, amd64. See the corresponding Makefile rules for details.

Drop-in replacement for Prometheus

If you use Prometheus only for scraping metrics from various targets and forwarding those metrics to remote storage then vmagent can replace Prometheus. tupically, vmagent requires lower amounts of RAM, CPU and network bandwidth compared with Prometheus. See these docs for details.

Replication and high availability

vmagent replicates the collected metrics among multiple remote storage instances configured via -remoteWrite.url args. If a single remote storage instance temporarily is out of service, then the collected data remains available in another remote storage instance. vmagent buffers the collected data in files at -remoteWrite.tmpDataPath until the remote storage becomes available again and then it sends the buffered data to the remote storage in order to prevent data gaps.

Relabeling and filtering

vmagent can add, remove or update labels on the collected data before sending it to the remote storage. Additionally, it can remove unwanted samples via Prometheus-like relabeling before sending the collected data to remote storage. Please see these docs for details.

Splitting data streams among multiple systems

vmagent supports splitting the collected data between muliple destinations with the help of -remoteWrite.urlRelabelConfig, which is applied independently for each configured -remoteWrite.url destination. For example, it is possible to replicate or split data among long-term remote storage, short-term remote storage and a real-time analytical system built on top of Kafka. Note that each destination can receive it's own subset of the collected data due to per-destination relabeling via -remoteWrite.urlRelabelConfig.

Prometheus remote_write proxy

vmagent can be used as a proxy for Prometheus data sent via Prometheus remote_write protocol. It can accept data via the remote_write API at the/api/v1/write endpoint. Then apply relabeling and filtering and proxy it to another remote_write system . The vmagent can be configured to encrypt the incoming remote_write requests with -tls* command-line flags. Also, Basic Auth can be enabled for the incoming remote_write requests with -httpAuth.* command-line flags.

remote_write for clustered version

While vmagent can accept data in several supported protocols (OpenTSDB, Influx, Prometheus, Graphite) and scrape data from various targets, writes are always peformed in Promethes remote_write protocol. Therefore for the clustered version, -remoteWrite.url the command-line flag should be configured as <schema>://<vminsert-host>:8480/insert/<customer-id>/prometheus/api/v1/write

How to collect metrics in Prometheus format

Specify the path to prometheus.yml file via -promscrape.config command-line flag. vmagent takes into account the following sections from Prometheus config file:

• global
• scrape_configs

All other sections are ignored, including the remote_write section. Use -remoteWrite.* command-line flag instead for configuring remote write settings.

The following scrape types in scrape_config section are supported:

• static_configs - is for scraping statically defined targets. See these docs for details.
• file_sd_configs - is for scraping targets defined in external files (aka file-based service discover). See these docs for details
• and kubernetes_sd_configs - for scraping targets in Kubernetes (k8s). See kubernetes_sd_config for details.
• ec2_sd_configs - is for scraping targets in Amazon EC2. See ec2_sd_config for details. vmagent doesn't support the profile config param and aws credentials file yet.
• gce_sd_configs - is for scraping targets in Google Compute Engine (GCE). See gce_sd_config for details. vmagent provides the following additional functionality for gce_sd_config:
  • if project arg is missing then vmagent uses the project for the instance where it runs;
  • if zone arg is missing then vmagent uses the zone for the instance where it runs;
  • if zone arg is equal to "*", then vmagent discovers all the zones for the given project;
  • zone may contain an arbitrary number of zones, i.e. zone: [us-east1-a, us-east1-b].
• consul_sd_configs - for scraping the targets registered in Consul. See consul_sd_config for details.
• dns_sd_configs - is for scraping targets discovered from DNS records (SRV, A and AAAA). See dns_sd_config for details.
• openstack_sd_configs - is for scraping OpenStack targets. See openstack_sd_config for details. OpenStack identity API v3 is supported only.
• dockerswarm_sd_configs - is for scraping Docker Swarm targets. See dockerswarm_sd_config for details.
• eureka_sd_configs - is for scraping targets registered in Netflix Eureka. See eureka_sd_config for details.

Please file feature requests to our issue tracker if you need other service discovery mechanisms to be supported by vmagent.

vmagent also support the following additional options in scrape_config section:

• disable_compression: true - to disable response compression on a per-job basis. By default vmagent requests compressed responses from scrape targets to save network bandwidth.
• disable_keepalive: true - to disable HTTP keep-alive connections on a per-job basis. By default, vmagent uses keep-alive connections to scrape targets to reduce overhead on connection re-establishing.

Note that vmagent doesn't support refresh_interval option for these scrape configs. Use the corresponding -promscrape.*CheckInterval command-line flag instead. For example, -promscrape.consulSDCheckInterval=60s sets refresh_interval for all the consul_sd_configs entries to 60s. Run vmagent -help in order to see default values for the -promscrape.*CheckInterval flags.

The file pointed by -promscrape.config may contain %{ENV_VAR} placeholders which are substituted by the corresponding ENV_VAR environment variable values.

Adding labels to metrics

Labels can be added to metrics by the following mechanisms:

• The global -> external_labels section in -promscrape.config file. These labels are added only to metrics scraped from targets configured in the -promscrape.config file.
• The -remoteWrite.label command-line flag. These labels are added to all the collected metrics before sending them to -remoteWrite.url.

Relabeling

vmagent supports Prometheus relabeling. and also provides the following actions:

• replace_all: replaces all of the occurences of regex in the values of source_labels with the replacement and stores the results in the target_label.
• labelmap_all: replaces all of the occurences of regex in all the label names with the replacement.
• keep_if_equal: keeps the entry if all the label values from source_labels are equal.
• drop_if_equal: drops the entry if all the label values from source_labels are equal.

The relabeling can be defined in the following places:

• At the scrape_config -> relabel_configs section in -promscrape.config file. This relabeling is applied to target labels.
• At the scrape_config -> metric_relabel_configs section in -promscrape.config file. This relabeling is applied to all the scraped metrics in the given scrape_config.
• At the -remoteWrite.relabelConfig file. This relabeling is aplied to all the collected metrics before sending them to remote storage.
• At the -remoteWrite.urlRelabelConfig files. This relabeling is applied to metrics before sending them to the corresponding -remoteWrite.url.

You can read more about relabeling in the following articles:

• How to use Relabeling in Prometheus and VictoriaMetrics
• Life of a label
• Discarding targets and timeseries with relabeling
• Dropping labels at scrape time
• Extracting labels from legacy metric names
• relabel_configs vs metric_relabel_configs

Scraping big number of targets

A single vmagent instance can scrape tens of thousands of scrape targets. Sometimes this isn't enough due to limitations on CPU, network, RAM, etc. In this case scrape targets can be split among multiple vmagent instances (aka vmagent clustering). Each vmagent instance in the cluster must use identical -promscrape.config files with distinct -promscrape.cluster.memberNum values. The flag value must be in the range 0 ... N-1, where N is the number of vmagent instances in the cluster. The number of vmagent instances in the cluster must be passed to -promscrape.cluster.membersCount command-line flag. For example, the following commands spread scrape targets among a cluster of two vmagent instances:

/path/to/vmagent -promscrape.cluster.membersCount=2 -promscrape.cluster.memberNum=0 -promscrape.config=/path/to/config.yml ...
/path/to/vmagent -promscrape.cluster.membersCount=2 -promscrape.cluster.memberNum=1 -promscrape.config=/path/to/config.yml ...

Monitoring

vmagent exports various metrics in Prometheus exposition format at http://vmagent-host:8429/metrics page. We recommend setting up regular scraping of this page either through vmagent itself or by Prometheus so that the exported metrics may be analyzed later. Use official Grafana dashboard for vmagent state overview. If you have suggestions for improvements or have found a bug -please open an issue on github or add a review to the dashboard.

vmagent also exports the status for various targets at the following handlers:

• http://vmagent-host:8429/targets. This handler returns human-readable plaintext status for every active target. This page is easy to query from the command line with wget, curl or similar tools. It accepts optional show_original_labels=1 query arg which shows the original labels per each target before applying the relabeling. This information may be useful for debugging target relabeling.

• http://vmagent-host:8429/api/v1/targets. This handler returns data compatible with the corresponding page from Prometheus API.

• http://vmagent-host:8429/ready. This handler returns http 200 status code when vmagent finishes it's initialization for all service_discovery configs. It may be useful to perform vmagent rolling update without any scrape loss.

Troubleshooting

• We recommend you set up the official Grafana dashboard in order to monitor the state of `vmagent'.

• We recommend you increase the maximum number of open files in the system (ulimit -n) when scraping a big number of targets, as vmagent establishes at least a single TCP connection per target.

• When vmagent scrapes many unreliable targets, it can flood the error log with scrape errors. These errors can be suppressed by passing -promscrape.suppressScrapeErrors command-line flag to vmagent. The most recent scrape error per each target can be observed at http://vmagent-host:8429/targets and http://vmagent-host:8429/api/v1/targets.

• The /api/v1/targets page could be useful for debugging relabeling process for scrape targets. This page contains original labels for targets dropped during relabeling (see "droppedTargets" section in the page output). By default the -promscrape.maxDroppedTargets targets are shown here. If your setup drops more targets during relabeling, then increase -promscrape.maxDroppedTargets command-line flag value to see all the dropped targets. Note that tracking each dropped target requires up to 10Kb of RAM. Therefore big values for -promscrape.maxDroppedTargets may result in increased memory usage if a big number of scrape targets are dropped during relabeling.

• If vmagent scrapes a big number of targets then the -promscrape.dropOriginalLabels command-line option may be passed to vmagent in order to reduce memory usage. This option drops "discoveredLabels" and "droppedTargets" lists at /api/v1/targets page, which may result in reduced debuggability for improperly configured per-target relabeling.

• If vmagent scrapes targets with millions of metrics per target (for example, when scraping federation endpoints), we recommend enabling stream parsing mode in order to reduce memory usage during scraping. This mode may be enabled either globally for all of the scrape targets by passing -promscrape.streamParse command-line flag or on a per-scrape target basis with stream_parse: true option. For example:

  scrape_configs:
  - job_name: 'big-federate'
    stream_parse: true
    static_configs:
    - targets:
      - big-prometeus1
      - big-prometeus2
    honor_labels: true
    metrics_path: /federate
    params:
      'match[]': ['{__name__!=""}']
  

  Note that sample_limit option doesn't work if stream parsing is enabled because the parsed data is pushed to remote storage as soon as it is parsed. Therefore the sample_limit option doesn't make sense during stream parsing.

• We recommend you increase -remoteWrite.queues if vmagent_remotewrite_pending_data_bytes metric exported at http://vmagent-host:8429/metrics page grows constantly.

• If you see gaps in the data pushed by vmagent to remote storage when -remoteWrite.maxDiskUsagePerURL is set, try increasing -remoteWrite.queues. Such gaps may appear because vmagent cannot keep up with sending the collected data to remote storage. Therefore it starts dropping the buffered data if the on-disk buffer size exceeds -remoteWrite.maxDiskUsagePerURL.

• vmagent buffers scraped data at the -remoteWrite.tmpDataPath directory until it is sent to -remoteWrite.url. The directory can grow large when remote storage is unavailable for extended periods of time and if -remoteWrite.maxDiskUsagePerURL isn't set. If you don't want to send all the data from the directory to remote storage then simply stop vmagent and delete the directory.

• By default vmagent masks -remoteWrite.url with secret-url values in logs and at /metrics page because the url may contain sensitive information such as auth tokens or passwords. Pass -remoteWrite.showURL command-line flag when starting vmagent in order to see all the valid urls.

• If scrapes must be aligned in time (for instance, if they must be performed at the beginning of every hour), then set the scrape_align_interval option in the corresponding scrape config. For example, the following config aligns hourly scrapes to the nearest 10 minutes:

  scrape_configs:
  - job_name: foo
    scrape_interval: 1h
    scrape_align_interval: 10m
  

• If you see skipping duplicate scrape target with identical labels errors when scraping Kubernetes pods, then it is likely these pods listen to multiple ports or they use an init container. These errors can either be fixed or suppressed with the -promscrape.suppressDuplicateScrapeTargetErrors command-line flag. See the available options below if you prefer fixing the root cause of the error:

  The following relabeling rule may be added to relabel_configs section in order to filter out pods with unneeded ports:

  - action: keep_if_equal
    source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_port, __meta_kubernetes_pod_container_port_number]
  

  The following relabeling rule may be added to relabel_configs section in order to filter out init container pods:

  - action: drop
    source_labels: [__meta_kubernetes_pod_container_init]
    regex: true
  

How to build from sources

We recommend using binary releases - vmagent is located in the vmutils-* archives .

Development build

1. Install Go. The minimum supported version is Go 1.14.
2. Run make vmagent from the root folder of the repository. It builds the vmagent binary and puts it into the bin folder.

Production build

1. Install docker.
2. Run make vmagent-prod from the root folder of the repository. It builds vmagent-prod binary and puts it into the bin folder.

Building docker images

Run make package-vmagent. It builds victoriametrics/vmagent:<PKG_TAG> docker image locally. <PKG_TAG> is an auto-generated image tag, which depends on source code in the repository. The <PKG_TAG> may be manually set via PKG_TAG=foobar make package-vmagent.

The base docker image is alpine but it is possible to use any other base image by setting it via <ROOT_IMAGE> environment variable. For example, the following command builds the image on top of scratch image:

ROOT_IMAGE=scratch make package-vmagent

ARM build

ARM build may run on Raspberry Pi or on energy-efficient ARM servers.

Development ARM build

1. Install Go. The minimum supported version is Go 1.14.
2. Run make vmagent-arm or make vmagent-arm64 from the root folder of the repository. It builds vmagent-arm or vmagent-arm64 binary respectively and puts it into the bin folder.

Production ARM build

1. Install docker.
2. Run make vmagent-arm-prod or make vmagent-arm64-prod from the root folder of the repository. It builds vmagent-arm-prod or vmagent-arm64-prod binary respectively and puts it into the bin folder.

Profiling

vmagent provides handlers for collecting the following Go profiles:

• Memory profile can be collected with the following command:

curl -s http://<vmagent-host>:8429/debug/pprof/heap > mem.pprof

• CPU profile can be collected with the following command:

curl -s http://<vmagent-host>:8429/debug/pprof/profile > cpu.pprof

The command for collecting CPU profile waits for 30 seconds before returning.

The collected profiles may be analyzed with go tool pprof.

Advanced usage

vmagent can be fine-tuned with various command-line flags. Run ./vmagent -help in order to see the full list of these flags with their desciptions and default values:

./vmagent -help

vmagent collects metrics data via popular data ingestion protocols and routes them to VictoriaMetrics.

See the docs at https://victoriametrics.github.io/vmagent.html .

  -csvTrimTimestamp duration
    	Trim timestamps when importing csv data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
  -dryRun
    	Whether to check only config files without running vmagent. The following files are checked: -promscrape.config, -remoteWrite.relabelConfig, -remoteWrite.urlRelabelConfig . Unknown config entries are allowed in -promscrape.config by default. This can be changed with -promscrape.config.strictParse
  -enableTCP6
    	Whether to enable IPv6 for listening and dialing. By default only IPv4 TCP is used
  -envflag.enable
    	Whether to enable reading flags from environment variables additionally to command line. Command line flag values have priority over values from environment vars. Flags are read only from command line if this flag isn't set
  -envflag.prefix string
    	Prefix for environment variables if -envflag.enable is set
  -fs.disableMmap
    	Whether to use pread() instead of mmap() for reading data files. By default mmap() is used for 64-bit arches and pread() is used for 32-bit arches, since they cannot read data files bigger than 2^32 bytes in memory. mmap() is usually faster for reading small data chunks than pread()
  -graphiteListenAddr string
    	TCP and UDP address to listen for Graphite plaintext data. Usually :2003 must be set. Doesn't work if empty
  -graphiteTrimTimestamp duration
    	Trim timestamps for Graphite data to this duration. Minimum practical duration is 1s. Higher duration (i.e. 1m) may be used for reducing disk space usage for timestamp data (default 1s)
  -http.connTimeout duration
    	Incoming http connections are closed after the configured timeout. This may help spreading incoming load among a cluster of services behind load balancer. Note that the real timeout may be bigger by up to 10% as a protection from Thundering herd problem (default 2m0s)
  -http.disableResponseCompression
    	Disable compression of HTTP responses for saving CPU resources. By default compression is enabled to save network bandwidth
  -http.idleConnTimeout duration
    	Timeout for incoming idle http connections (default 1m0s)
  -http.maxGracefulShutdownDuration duration
    	The maximum duration for graceful shutdown of HTTP server. Highly loaded server may require increased value for graceful shutdown (default 7s)
  -http.pathPrefix string
    	An optional prefix to add to all the paths handled by http server. For example, if '-http.pathPrefix=/foo/bar' is set, then all the http requests will be handled on '/foo/bar/*' paths. This may be useful for proxied requests. See https://www.robustperception.io/using-external-urls-and-proxies-with-prometheus
  -http.shutdownDelay duration
    	Optional delay before http server shutdown. During this dealy the servier returns non-OK responses from /health page, so load balancers can route new requests to other servers
  -httpAuth.password string
    	Password for HTTP Basic Auth. The authentication is disabled if -httpAuth.username is empty
  -httpAuth.username string
    	Username for HTTP Basic Auth. The authentication is disabled if empty. See also -httpAuth.password
  -httpListenAddr string
    	TCP address to listen for http connections. Set this flag to empty value in order to disable listening on any port. This mode may be useful for running multiple vmagent instances on the same server. Note that /targets and /metrics pages aren't available if -httpListenAddr='' (default ":8429")
  -import.maxLineLen max_rows_per_line
    	The maximum length in bytes of a single line accepted by /api/v1/import; the line length can be limited with max_rows_per_line query arg passed to /api/v1/export
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 104857600)
  -influx.maxLineSize value
    	The maximum size in bytes for a single Influx line during parsing
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 262144)
  -influxListenAddr http://<vmagent>:8429/write
    	TCP and UDP address to listen for Influx line protocol data. Usually :8189 must be set. Doesn't work if empty. This flag isn't needed when ingesting data over HTTP - just send it to http://<vmagent>:8429/write
  -influxMeasurementFieldSeparator string
    	Separator for '{measurement}{separator}{field_name}' metric name when inserted via Influx line protocol (default "_")
  -influxSkipMeasurement
    	Uses '{field_name}' as a metric name while ignoring '{measurement}' and '-influxMeasurementFieldSeparator'
  -influxSkipSingleField
    	Uses '{measurement}' instead of '{measurement}{separator}{field_name}' for metic name if Influx line contains only a single field
  -influxTrimTimestamp duration
    	Trim timestamps for Influx line protocol data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
  -insert.maxQueueDuration duration
    	The maximum duration for waiting in the queue for insert requests due to -maxConcurrentInserts (default 1m0s)
  -loggerDisableTimestamps
    	Whether to disable writing timestamps in logs
  -loggerErrorsPerSecondLimit int
    	Per-second limit on the number of ERROR messages. If more than the given number of errors are emitted per second, then the remaining errors are suppressed. Zero value disables the rate limit
  -loggerFormat string
    	Format for logs. Possible values: default, json (default "default")
  -loggerLevel string
    	Minimum level of errors to log. Possible values: INFO, WARN, ERROR, FATAL, PANIC (default "INFO")
  -loggerOutput string
    	Output for the logs. Supported values: stderr, stdout (default "stderr")
  -loggerTimezone string
    	Timezone to use for timestamps in logs. Timezone must be a valid IANA Time Zone. For example: America/New_York, Europe/Berlin, Etc/GMT+3 or Local (default "UTC")
  -loggerWarnsPerSecondLimit int
    	Per-second limit on the number of WARN messages. If more than the given number of warns are emitted per second, then the remaining warns are suppressed. Zero value disables the rate limit
  -maxConcurrentInserts int
    	The maximum number of concurrent inserts. Default value should work for most cases, since it minimizes the overhead for concurrent inserts. This option is tigthly coupled with -insert.maxQueueDuration (default 16)
  -maxInsertRequestSize value
    	The maximum size in bytes of a single Prometheus remote_write API request
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 33554432)
  -memory.allowedBytes value
    	Allowed size of system memory VictoriaMetrics caches may occupy. This option overrides -memory.allowedPercent if set to non-zero value. Too low value may increase cache miss rate, which usually results in higher CPU and disk IO usage. Too high value may evict too much data from OS page cache, which will result in higher disk IO usage
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 0)
  -memory.allowedPercent float
    	Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low value may increase cache miss rate, which usually results in higher CPU and disk IO usage. Too high value may evict too much data from OS page cache, which will result in higher disk IO usage (default 60)
  -metricsAuthKey string
    	Auth key for /metrics. It overrides httpAuth settings
  -opentsdbHTTPListenAddr string
    	TCP address to listen for OpentTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty
  -opentsdbListenAddr string
    	TCP and UDP address to listen for OpentTSDB metrics. Telnet put messages and HTTP /api/put messages are simultaneously served on TCP port. Usually :4242 must be set. Doesn't work if empty
  -opentsdbTrimTimestamp duration
    	Trim timestamps for OpenTSDB 'telnet put' data to this duration. Minimum practical duration is 1s. Higher duration (i.e. 1m) may be used for reducing disk space usage for timestamp data (default 1s)
  -opentsdbhttp.maxInsertRequestSize value
    	The maximum size of OpenTSDB HTTP put request
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 33554432)
  -opentsdbhttpTrimTimestamp duration
    	Trim timestamps for OpenTSDB HTTP data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
  -pprofAuthKey string
    	Auth key for /debug/pprof. It overrides httpAuth settings
  -promscrape.cluster.memberNum int
    	The number of number in the cluster of scrapers. It must be an unique value in the range 0 ... promscrape.cluster.membersCount-1 across scrapers in the cluster
  -promscrape.cluster.membersCount int
    	The number of members in a cluster of scrapers. Each member must have an unique -promscrape.cluster.memberNum in the range 0 ... promscrape.cluster.membersCount-1 . Each member then scrapes roughly 1/N of all the targets. By default cluster scraping is disabled, i.e. a single scraper scrapes all the targets
  -promscrape.config string
    	Optional path to Prometheus config file with 'scrape_configs' section containing targets to scrape. See https://victoriametrics.github.io/#how-to-scrape-prometheus-exporters-such-as-node-exporter for details
  -promscrape.config.dryRun
    	Checks -promscrape.config file for errors and unsupported fields and then exits. Returns non-zero exit code on parsing errors and emits these errors to stderr. See also -promscrape.config.strictParse command-line flag. Pass -loggerLevel=ERROR if you don't need to see info messages in the output.
  -promscrape.config.strictParse
    	Whether to allow only supported fields in -promscrape.config . By default unsupported fields are silently skipped
  -promscrape.configCheckInterval duration
    	Interval for checking for changes in '-promscrape.config' file. By default the checking is disabled. Send SIGHUP signal in order to force config check for changes
  -promscrape.consulSDCheckInterval consul_sd_configs
    	Interval for checking for changes in Consul. This works only if consul_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#consul_sd_config for details (default 30s)
  -promscrape.disableCompression
    	Whether to disable sending 'Accept-Encoding: gzip' request headers to all the scrape targets. This may reduce CPU usage on scrape targets at the cost of higher network bandwidth utilization. It is possible to set 'disable_compression: true' individually per each 'scrape_config' section in '-promscrape.config' for fine grained control
  -promscrape.disableKeepAlive disable_keepalive: true
    	Whether to disable HTTP keep-alive connections when scraping all the targets. This may be useful when targets has no support for HTTP keep-alive connection. It is possible to set disable_keepalive: true individually per each 'scrape_config` section in '-promscrape.config' for fine grained control. Note that disabling HTTP keep-alive may increase load on both vmagent and scrape targets
  -promscrape.discovery.concurrency int
    	The maximum number of concurrent requests to Prometheus autodiscovery API (Consul, Kubernetes, etc.) (default 100)
  -promscrape.discovery.concurrentWaitTime duration
    	The maximum duration for waiting to perform API requests if more than -promscrape.discovery.concurrency requests are simultaneously performed (default 1m0s)
  -promscrape.dnsSDCheckInterval dns_sd_configs
    	Interval for checking for changes in dns. This works only if dns_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dns_sd_config for details (default 30s)
  -promscrape.dockerswarmSDCheckInterval dockerswarm_sd_configs
    	Interval for checking for changes in dockerswarm. This works only if dockerswarm_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config for details (default 30s)
  -promscrape.dropOriginalLabels
    	Whether to drop original labels for scrape targets at /targets and /api/v1/targets pages. This may be needed for reducing memory usage when original labels for big number of scrape targets occupy big amounts of memory. Note that this reduces debuggability for improper per-target relabeling configs
  -promscrape.ec2SDCheckInterval ec2_sd_configs
    	Interval for checking for changes in ec2. This works only if ec2_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#ec2_sd_config for details (default 1m0s)
  -promscrape.eurekaSDCheckInterval eureka_sd_configs
    	Interval for checking for changes in eureka. This works only if eureka_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config for details (default 30s)
  -promscrape.fileSDCheckInterval duration
    	Interval for checking for changes in 'file_sd_config'. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config for details (default 30s)
  -promscrape.gceSDCheckInterval gce_sd_configs
    	Interval for checking for changes in gce. This works only if gce_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#gce_sd_config for details (default 1m0s)
  -promscrape.kubernetes.apiServerTimeout duration
    	How frequently to reload the full state from Kuberntes API server (default 10m0s)
  -promscrape.kubernetesSDCheckInterval kubernetes_sd_configs
    	Interval for checking for changes in Kubernetes API server. This works only if kubernetes_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#kubernetes_sd_config for details (default 30s)
  -promscrape.maxDroppedTargets droppedTargets
    	The maximum number of droppedTargets shown at /api/v1/targets page. Increase this value if your setup drops more scrape targets during relabeling and you need investigating labels for all the dropped targets. Note that the increased number of tracked dropped targets may result in increased memory usage (default 1000)
  -promscrape.maxScrapeSize value
    	The maximum size of scrape response in bytes to process from Prometheus targets. Bigger responses are rejected
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 16777216)
  -promscrape.openstackSDCheckInterval openstack_sd_configs
    	Interval for checking for changes in openstack API server. This works only if openstack_sd_configs is configured in '-promscrape.config' file. See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#openstack_sd_config for details (default 30s)
  -promscrape.streamParse stream_parse: true
    	Whether to enable stream parsing for metrics obtained from scrape targets. This may be useful for reducing memory usage when millions of metrics are exposed per each scrape target. It is posible to set stream_parse: true individually per each `scrape_config` section in `-promscrape.config` for fine grained control
  -promscrape.suppressDuplicateScrapeTargetErrors duplicate scrape target
    	Whether to suppress duplicate scrape target errors; see https://victoriametrics.github.io/vmagent.html#troubleshooting for details
  -promscrape.suppressScrapeErrors
    	Whether to suppress scrape errors logging. The last error for each target is always available at '/targets' page even if scrape errors logging is suppressed
  -remoteWrite.basicAuth.password array
    	Optional basic auth password to use for -remoteWrite.url. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.basicAuth.username array
    	Optional basic auth username to use for -remoteWrite.url. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.bearerToken array
    	Optional bearer auth token to use for -remoteWrite.url. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.flushInterval duration
    	Interval for flushing the data to remote storage. This option takes effect only when less than 10K data points per second are pushed to -remoteWrite.url (default 1s)
  -remoteWrite.label array
    	Optional label in the form 'name=value' to add to all the metrics before sending them to -remoteWrite.url. Pass multiple -remoteWrite.label flags in order to add multiple flags to metrics before sending them to remote storage
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.maxBlockSize value
    	The maximum size in bytes of unpacked request to send to remote storage. It shouldn't exceed -maxInsertRequestSize from VictoriaMetrics
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 8388608)
  -remoteWrite.maxDiskUsagePerURL value
    	The maximum file-based buffer size in bytes at -remoteWrite.tmpDataPath for each -remoteWrite.url. When buffer size reaches the configured maximum, then old data is dropped when adding new data to the buffer. Buffered data is stored in ~500MB chunks, so the minimum practical value for this flag is 500000000. Disk usage is unlimited if the value is set to 0
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 0)
  -remoteWrite.proxyURL array
    	Optional proxy URL for writing data to -remoteWrite.url. Supported proxies: http, https, socks5. Example: -remoteWrite.proxyURL=socks5://proxy:1234
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.queues int
    	The number of concurrent queues to each -remoteWrite.url. Set more queues if default number of queues isn't enough for sending high volume of collected data to remote storage (default 4)
  -remoteWrite.rateLimit array
    	Optional rate limit in bytes per second for data sent to -remoteWrite.url. By default the rate limit is disabled. It can be useful for limiting load on remote storage when big amounts of buffered data is sent after temporary unavailability of the remote storage
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.relabelConfig string
    	Optional path to file with relabel_config entries. These entries are applied to all the metrics before sending them to -remoteWrite.url. See https://victoriametrics.github.io/vmagent.html#relabeling for details
  -remoteWrite.roundDigits array
    	Round metric values to this number of decimal digits after the point before writing them to remote storage. Examples: -remoteWrite.roundDigits=2 would round 1.236 to 1.24, while -remoteWrite.roundDigits=-1 would round 126.78 to 130. By default digits rounding is disabled. Set it to 100 for disabling it for a particular remote storage. This option may be used for improving data compression for the stored metrics
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.sendTimeout array
    	Timeout for sending a single block of data to -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.showURL
    	Whether to show -remoteWrite.url in the exported metrics. It is hidden by default, since it can contain sensitive info such as auth key
  -remoteWrite.significantFigures array
    	The number of significant figures to leave in metric values before writing them to remote storage. See https://en.wikipedia.org/wiki/Significant_figures . Zero value saves all the significant figures. This option may be used for improving data compression for the stored metrics. See also -remoteWrite.roundDigits
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.tlsCAFile array
    	Optional path to TLS CA file to use for verifying connections to -remoteWrite.url. By default system CA is used. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.tlsCertFile array
    	Optional path to client-side TLS certificate file to use when connecting to -remoteWrite.url. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.tlsInsecureSkipVerify array
    	Whether to skip tls verification when connecting to -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.tlsKeyFile array
    	Optional path to client-side TLS certificate key to use when connecting to -remoteWrite.url. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.tlsServerName array
    	Optional TLS server name to use for connections to -remoteWrite.url. By default the server name from -remoteWrite.url is used. If multiple args are set, then they are applied independently for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.tmpDataPath string
    	Path to directory where temporary data for remote write component is stored (default "vmagent-remotewrite-data")
  -remoteWrite.url array
    	Remote storage URL to write data to. It must support Prometheus remote_write API. It is recommended using VictoriaMetrics as remote storage. Example url: http://<victoriametrics-host>:8428/api/v1/write . Pass multiple -remoteWrite.url flags in order to write data concurrently to multiple remote storage systems
    	Supports array of values separated by comma or specified via multiple flags.
  -remoteWrite.urlRelabelConfig array
    	Optional path to relabel config for the corresponding -remoteWrite.url
    	Supports array of values separated by comma or specified via multiple flags.
  -tls
    	Whether to enable TLS (aka HTTPS) for incoming requests. -tlsCertFile and -tlsKeyFile must be set if -tls is set
  -tlsCertFile string
    	Path to file with TLS certificate. Used only if -tls is set. Prefer ECDSA certs instead of RSA certs, since RSA certs are slow
  -tlsKeyFile string
    	Path to file with TLS key. Used only if -tls is set
  -version
    	Show VictoriaMetrics version