mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
09f796e2ab
This should reduce CPU load during scraping when target discovery generates big number of `__meta_*` labels (for instance, k8s discovery). See https://www.robustperception.io/life-of-a-label for details.
564 lines
19 KiB
Go
564 lines
19 KiB
Go
package promscrape
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"net/url"
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"path/filepath"
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"strings"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/kubernetes"
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"gopkg.in/yaml.v2"
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)
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var (
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strictParse = flag.Bool("promscrape.config.strictParse", false, "Whether to allow only supported fields in '-promscrape.config'. "+
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"This option may be used for errors detection in '-promscrape.config' file")
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)
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// Config represents essential parts from Prometheus config defined at https://prometheus.io/docs/prometheus/latest/configuration/configuration/
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type Config struct {
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Global GlobalConfig `yaml:"global"`
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ScrapeConfigs []ScrapeConfig `yaml:"scrape_configs"`
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// This is set to the directory from where the config has been loaded.
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baseDir string
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}
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// GlobalConfig represents essential parts for `global` section of Prometheus config.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/
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type GlobalConfig struct {
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ScrapeInterval time.Duration `yaml:"scrape_interval"`
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ScrapeTimeout time.Duration `yaml:"scrape_timeout"`
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ExternalLabels map[string]string `yaml:"external_labels"`
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}
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// ScrapeConfig represents essential parts for `scrape_config` section of Prometheus config.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
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type ScrapeConfig struct {
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JobName string `yaml:"job_name"`
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ScrapeInterval time.Duration `yaml:"scrape_interval"`
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ScrapeTimeout time.Duration `yaml:"scrape_timeout"`
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MetricsPath string `yaml:"metrics_path"`
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HonorLabels bool `yaml:"honor_labels"`
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HonorTimestamps bool `yaml:"honor_timestamps"`
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Scheme string `yaml:"scheme"`
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Params map[string][]string `yaml:"params"`
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BasicAuth *promauth.BasicAuthConfig `yaml:"basic_auth"`
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BearerToken string `yaml:"bearer_token"`
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BearerTokenFile string `yaml:"bearer_token_file"`
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TLSConfig *promauth.TLSConfig `yaml:"tls_config"`
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StaticConfigs []StaticConfig `yaml:"static_configs"`
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FileSDConfigs []FileSDConfig `yaml:"file_sd_configs"`
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KubernetesSDConfigs []KubernetesSDConfig `yaml:"kubernetes_sd_configs"`
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RelabelConfigs []promrelabel.RelabelConfig `yaml:"relabel_configs"`
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MetricRelabelConfigs []promrelabel.RelabelConfig `yaml:"metric_relabel_configs"`
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SampleLimit int `yaml:"sample_limit"`
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// This is set in loadConfig
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swc *scrapeWorkConfig
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}
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// FileSDConfig represents file-based service discovery config.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config
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type FileSDConfig struct {
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Files []string `yaml:"files"`
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// `refresh_interval` is ignored. See `-prometheus.fileSDCheckInterval`
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}
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// KubernetesSDConfig represents kubernetes-based service discovery config.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#kubernetes_sd_config
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type KubernetesSDConfig struct {
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APIServer string `yaml:"api_server"`
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Role string `yaml:"role"`
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BasicAuth *promauth.BasicAuthConfig `yaml:"basic_auth"`
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BearerToken string `yaml:"bearer_token"`
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BearerTokenFile string `yaml:"bearer_token_file"`
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TLSConfig *promauth.TLSConfig `yaml:"tls_config"`
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Namespaces KubernetesNamespaces `yaml:"namespaces"`
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Selectors []kubernetes.Selector `yaml:"selectors"`
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}
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// KubernetesNamespaces represents namespaces for KubernetesSDConfig
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type KubernetesNamespaces struct {
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Names []string `yaml:"names"`
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}
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// StaticConfig represents essential parts for `static_config` section of Prometheus config.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#static_config
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type StaticConfig struct {
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Targets []string `yaml:"targets"`
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Labels map[string]string `yaml:"labels"`
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}
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func loadStaticConfigs(path string) ([]StaticConfig, error) {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("cannot read `static_configs` from %q: %s", path, err)
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}
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var stcs []StaticConfig
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if err := yaml.UnmarshalStrict(data, &stcs); err != nil {
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return nil, fmt.Errorf("cannot unmarshal `static_configs` from %q: %s", path, err)
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}
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return stcs, nil
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}
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// loadConfig loads Prometheus config from the given path.
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func loadConfig(path string) (cfg *Config, err error) {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("cannot read Prometheus config from %q: %s", path, err)
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}
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var cfgObj Config
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if err := cfgObj.parse(data, path); err != nil {
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return nil, fmt.Errorf("cannot parse Prometheus config from %q: %s", path, err)
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}
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return &cfgObj, nil
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}
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func (cfg *Config) parse(data []byte, path string) error {
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if err := unmarshalMaybeStrict(data, cfg); err != nil {
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return fmt.Errorf("cannot unmarshal data: %s", err)
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}
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absPath, err := filepath.Abs(path)
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if err != nil {
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return fmt.Errorf("cannot obtain abs path for %q: %s", path, err)
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}
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cfg.baseDir = filepath.Dir(absPath)
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for i := range cfg.ScrapeConfigs {
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sc := &cfg.ScrapeConfigs[i]
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swc, err := getScrapeWorkConfig(sc, cfg.baseDir, &cfg.Global)
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if err != nil {
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return fmt.Errorf("cannot parse `scrape_config` #%d: %s", i+1, err)
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}
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sc.swc = swc
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}
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return nil
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}
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func unmarshalMaybeStrict(data []byte, dst interface{}) error {
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var err error
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if *strictParse {
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err = yaml.UnmarshalStrict(data, dst)
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} else {
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err = yaml.Unmarshal(data, dst)
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}
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return err
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}
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func (cfg *Config) kubernetesSDConfigsCount() int {
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n := 0
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for i := range cfg.ScrapeConfigs {
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n += len(cfg.ScrapeConfigs[i].KubernetesSDConfigs)
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}
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return n
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}
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func (cfg *Config) fileSDConfigsCount() int {
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n := 0
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for i := range cfg.ScrapeConfigs {
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n += len(cfg.ScrapeConfigs[i].FileSDConfigs)
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}
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return n
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}
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// getKubernetesSDcrapeWork returns `kubernetes_sd_configs` ScrapeWork from cfg.
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func (cfg *Config) getKubernetesSDScrapeWork() []ScrapeWork {
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var dst []ScrapeWork
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for _, sc := range cfg.ScrapeConfigs {
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for _, sdc := range sc.KubernetesSDConfigs {
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dst = sdc.appendScrapeWork(dst, cfg.baseDir, sc.swc)
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}
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}
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return dst
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}
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// getFileSDScrapeWork returns `file_sd_configs` ScrapeWork from cfg.
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func (cfg *Config) getFileSDScrapeWork(prev []ScrapeWork) []ScrapeWork {
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// Create a map for the previous scrape work.
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swPrev := make(map[string][]ScrapeWork)
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for i := range prev {
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sw := &prev[i]
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label := promrelabel.GetLabelByName(sw.Labels, "__vm_filepath")
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if label == nil {
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logger.Panicf("BUG: missing `__vm_filepath` label")
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} else {
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swPrev[label.Value] = append(swPrev[label.Value], *sw)
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}
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}
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var dst []ScrapeWork
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for _, sc := range cfg.ScrapeConfigs {
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for _, sdc := range sc.FileSDConfigs {
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dst = sdc.appendScrapeWork(dst, swPrev, cfg.baseDir, sc.swc)
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}
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}
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return dst
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}
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// getStaticScrapeWork returns `static_configs` ScrapeWork from from cfg.
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func (cfg *Config) getStaticScrapeWork() []ScrapeWork {
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var dst []ScrapeWork
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for _, sc := range cfg.ScrapeConfigs {
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for _, stc := range sc.StaticConfigs {
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dst = stc.appendScrapeWork(dst, sc.swc, nil)
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}
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}
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return dst
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}
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func getScrapeWorkConfig(sc *ScrapeConfig, baseDir string, globalCfg *GlobalConfig) (*scrapeWorkConfig, error) {
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jobName := sc.JobName
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if jobName == "" {
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return nil, fmt.Errorf("missing `job_name` field in `scrape_config`")
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}
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scrapeInterval := sc.ScrapeInterval
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if scrapeInterval <= 0 {
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scrapeInterval = globalCfg.ScrapeInterval
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if scrapeInterval <= 0 {
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scrapeInterval = defaultScrapeInterval
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}
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}
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scrapeTimeout := sc.ScrapeTimeout
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if scrapeTimeout <= 0 {
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scrapeTimeout = globalCfg.ScrapeTimeout
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if scrapeTimeout <= 0 {
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scrapeTimeout = defaultScrapeTimeout
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}
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}
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honorLabels := sc.HonorLabels
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honorTimestamps := sc.HonorTimestamps
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metricsPath := sc.MetricsPath
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if metricsPath == "" {
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metricsPath = "/metrics"
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}
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scheme := sc.Scheme
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if scheme == "" {
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scheme = "http"
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}
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if scheme != "http" && scheme != "https" {
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return nil, fmt.Errorf("unexpected `scheme` for `job_name` %q: %q; supported values: http or https", jobName, scheme)
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}
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params := sc.Params
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ac, err := promauth.NewConfig(baseDir, sc.BasicAuth, sc.BearerToken, sc.BearerTokenFile, sc.TLSConfig)
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if err != nil {
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return nil, fmt.Errorf("cannot parse auth config for `job_name` %q: %s", jobName, err)
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}
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var relabelConfigs []promrelabel.ParsedRelabelConfig
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relabelConfigs, err = promrelabel.ParseRelabelConfigs(relabelConfigs[:0], sc.RelabelConfigs)
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if err != nil {
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return nil, fmt.Errorf("cannot parse `relabel_configs` for `job_name` %q: %s", jobName, err)
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}
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var metricRelabelConfigs []promrelabel.ParsedRelabelConfig
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metricRelabelConfigs, err = promrelabel.ParseRelabelConfigs(metricRelabelConfigs[:0], sc.MetricRelabelConfigs)
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if err != nil {
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return nil, fmt.Errorf("cannot parse `metric_relabel_configs` for `job_name` %q: %s", jobName, err)
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}
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swc := &scrapeWorkConfig{
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scrapeInterval: scrapeInterval,
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scrapeTimeout: scrapeTimeout,
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jobName: jobName,
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metricsPath: metricsPath,
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scheme: scheme,
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params: params,
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authConfig: ac,
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honorLabels: honorLabels,
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honorTimestamps: honorTimestamps,
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externalLabels: globalCfg.ExternalLabels,
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relabelConfigs: relabelConfigs,
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metricRelabelConfigs: metricRelabelConfigs,
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sampleLimit: sc.SampleLimit,
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}
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return swc, nil
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}
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type scrapeWorkConfig struct {
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scrapeInterval time.Duration
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scrapeTimeout time.Duration
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jobName string
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metricsPath string
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scheme string
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params map[string][]string
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authConfig *promauth.Config
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honorLabels bool
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honorTimestamps bool
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externalLabels map[string]string
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relabelConfigs []promrelabel.ParsedRelabelConfig
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metricRelabelConfigs []promrelabel.ParsedRelabelConfig
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sampleLimit int
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}
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func (sdc *KubernetesSDConfig) appendScrapeWork(dst []ScrapeWork, baseDir string, swc *scrapeWorkConfig) []ScrapeWork {
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ac, err := promauth.NewConfig(baseDir, sdc.BasicAuth, sdc.BearerToken, sdc.BearerTokenFile, sdc.TLSConfig)
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if err != nil {
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logger.Errorf("cannot parse auth config for `kubernetes_sd_config` for `job_name` %q: %s; skipping it", swc.jobName, err)
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return dst
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}
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cfg := &kubernetes.APIConfig{
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Server: sdc.APIServer,
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AuthConfig: ac,
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Namespaces: sdc.Namespaces.Names,
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Selectors: sdc.Selectors,
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}
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switch sdc.Role {
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case "node":
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targetLabels, err := kubernetes.GetNodesLabels(cfg)
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if err != nil {
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logger.Errorf("error when discovering kubernetes nodes for `job_name` %q: %s; skipping it", swc.jobName, err)
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return dst
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}
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return appendKubernetesScrapeWork(dst, swc, targetLabels, sdc.Role)
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case "service":
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targetLabels, err := kubernetes.GetServicesLabels(cfg)
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if err != nil {
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logger.Errorf("error when discovering kubernetes services for `job_name` %q: %s; skipping it", swc.jobName, err)
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return dst
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}
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return appendKubernetesScrapeWork(dst, swc, targetLabels, sdc.Role)
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case "pod":
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targetLabels, err := kubernetes.GetPodsLabels(cfg)
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if err != nil {
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logger.Errorf("error when discovering kubernetes pods for `job_name` %q: %s; skipping it", swc.jobName, err)
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return dst
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}
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return appendKubernetesScrapeWork(dst, swc, targetLabels, sdc.Role)
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case "endpoints":
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targetLabels, err := kubernetes.GetEndpointsLabels(cfg)
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if err != nil {
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logger.Errorf("error when discovering kubernetes endpoints for `job_name` %q: %s; skipping it", swc.jobName, err)
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return dst
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}
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return appendKubernetesScrapeWork(dst, swc, targetLabels, sdc.Role)
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case "ingress":
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targetLabels, err := kubernetes.GetIngressesLabels(cfg)
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if err != nil {
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logger.Errorf("error when discovering kubernetes ingresses for `job_name` %q: %s; skipping it", swc.jobName, err)
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return dst
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}
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return appendKubernetesScrapeWork(dst, swc, targetLabels, sdc.Role)
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default:
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logger.Errorf("unexpected `role`: %q; must be one of `node`, `service`, `pod`, `endpoints` or `ingress`; skipping it", sdc.Role)
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return dst
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}
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}
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func appendKubernetesScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, targetLabels []map[string]string, role string) []ScrapeWork {
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for _, metaLabels := range targetLabels {
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target := metaLabels["__address__"]
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var err error
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dst, err = appendScrapeWork(dst, swc, target, nil, metaLabels)
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if err != nil {
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logger.Errorf("error when parsing `kubernetes_sd_config` target %q with role %q for `job_name` %q: %s; skipping it",
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target, role, swc.jobName, err)
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continue
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}
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}
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return dst
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}
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func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swPrev map[string][]ScrapeWork, baseDir string, swc *scrapeWorkConfig) []ScrapeWork {
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for _, file := range sdc.Files {
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pathPattern := getFilepath(baseDir, file)
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paths := []string{pathPattern}
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if strings.Contains(pathPattern, "*") {
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var err error
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paths, err = filepath.Glob(pathPattern)
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if err != nil {
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// Do not return this error, since other files may contain valid scrape configs.
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logger.Errorf("invalid pattern %q in `files` section: %s; skipping it", file, err)
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continue
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}
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}
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for _, path := range paths {
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stcs, err := loadStaticConfigs(path)
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if err != nil {
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// Do not return this error, since other paths may contain valid scrape configs.
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if sws := swPrev[path]; sws != nil {
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// Re-use the previous valid scrape work for this path.
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logger.Errorf("keeping the previously loaded `static_configs` from %q because of error when re-loading the file: %s", path, err)
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dst = append(dst, sws...)
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} else {
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logger.Errorf("skipping loading `static_configs` from %q because of error: %s", path, err)
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}
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continue
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}
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pathShort := path
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if strings.HasPrefix(pathShort, baseDir) {
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pathShort = path[len(baseDir):]
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if len(pathShort) > 0 && pathShort[0] == filepath.Separator {
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pathShort = pathShort[1:]
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}
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}
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metaLabels := map[string]string{
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"__meta_filepath": pathShort,
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"__vm_filepath": pathShort, // This label is needed for internal promscrape logic
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}
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for i := range stcs {
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dst = stcs[i].appendScrapeWork(dst, swc, metaLabels)
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}
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}
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}
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return dst
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}
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func (stc *StaticConfig) appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, metaLabels map[string]string) []ScrapeWork {
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for _, target := range stc.Targets {
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if target == "" {
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// Do not return this error, since other targets may be valid
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logger.Errorf("`static_configs` target for `job_name` %q cannot be empty; skipping it", swc.jobName)
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continue
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}
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var err error
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dst, err = appendScrapeWork(dst, swc, target, stc.Labels, metaLabels)
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if err != nil {
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// Do not return this error, since other targets may be valid
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logger.Errorf("error when parsing `static_configs` target %q for `job_name` %q: %s; skipping it", target, swc.jobName, err)
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continue
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}
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}
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return dst
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}
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func appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, target string, extraLabels, metaLabels map[string]string) ([]ScrapeWork, error) {
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labels := mergeLabels(swc.jobName, swc.scheme, target, swc.metricsPath, extraLabels, swc.externalLabels, metaLabels, swc.params)
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labels = promrelabel.ApplyRelabelConfigs(labels, 0, swc.relabelConfigs, false)
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labels = promrelabel.RemoveMetaLabels(labels[:0], labels)
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if len(labels) == 0 {
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// Drop target without labels.
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return dst, nil
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}
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// See https://www.robustperception.io/life-of-a-label
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schemeRelabeled := ""
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if schemeLabel := promrelabel.GetLabelByName(labels, "__scheme__"); schemeLabel != nil {
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schemeRelabeled = schemeLabel.Value
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}
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if schemeRelabeled == "" {
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schemeRelabeled = "http"
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}
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addressLabel := promrelabel.GetLabelByName(labels, "__address__")
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if addressLabel == nil || addressLabel.Name == "" {
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// Drop target without scrape address.
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return dst, nil
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}
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targetRelabeled := addMissingPort(schemeRelabeled, addressLabel.Value)
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if strings.Contains(targetRelabeled, "/") {
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// Drop target with '/'
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return dst, nil
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}
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metricsPathRelabeled := ""
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if metricsPathLabel := promrelabel.GetLabelByName(labels, "__metrics_path__"); metricsPathLabel != nil {
|
|
metricsPathRelabeled = metricsPathLabel.Value
|
|
}
|
|
if metricsPathRelabeled == "" {
|
|
metricsPathRelabeled = "/metrics"
|
|
}
|
|
paramsRelabeled := getParamsFromLabels(labels, swc.params)
|
|
optionalQuestion := "?"
|
|
if len(paramsRelabeled) == 0 || strings.Contains(metricsPathRelabeled, "?") {
|
|
optionalQuestion = ""
|
|
}
|
|
paramsStr := url.Values(paramsRelabeled).Encode()
|
|
scrapeURL := fmt.Sprintf("%s://%s%s%s%s", schemeRelabeled, targetRelabeled, metricsPathRelabeled, optionalQuestion, paramsStr)
|
|
if _, err := url.Parse(scrapeURL); err != nil {
|
|
return dst, fmt.Errorf("invalid url %q for scheme=%q (%q), target=%q (%q), metrics_path=%q (%q) for `job_name` %q: %s",
|
|
scrapeURL, swc.scheme, schemeRelabeled, target, targetRelabeled, swc.metricsPath, metricsPathRelabeled, swc.jobName, err)
|
|
}
|
|
dst = append(dst, ScrapeWork{
|
|
ScrapeURL: scrapeURL,
|
|
ScrapeInterval: swc.scrapeInterval,
|
|
ScrapeTimeout: swc.scrapeTimeout,
|
|
HonorLabels: swc.honorLabels,
|
|
HonorTimestamps: swc.honorTimestamps,
|
|
Labels: labels,
|
|
AuthConfig: swc.authConfig,
|
|
MetricRelabelConfigs: swc.metricRelabelConfigs,
|
|
SampleLimit: swc.sampleLimit,
|
|
})
|
|
return dst, nil
|
|
}
|
|
|
|
func getParamsFromLabels(labels []prompbmarshal.Label, paramsOrig map[string][]string) map[string][]string {
|
|
// See https://www.robustperception.io/life-of-a-label
|
|
m := make(map[string][]string)
|
|
for i := range labels {
|
|
label := &labels[i]
|
|
if !strings.HasPrefix(label.Name, "__param_") {
|
|
continue
|
|
}
|
|
name := label.Name[len("__param_"):]
|
|
values := []string{label.Value}
|
|
if p := paramsOrig[name]; len(p) > 1 {
|
|
values = append(values, p[1:]...)
|
|
}
|
|
m[name] = values
|
|
}
|
|
return m
|
|
}
|
|
|
|
func mergeLabels(job, scheme, target, metricsPath string, extraLabels, externalLabels, metaLabels map[string]string, params map[string][]string) []prompbmarshal.Label {
|
|
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
|
|
m := make(map[string]string)
|
|
for k, v := range externalLabels {
|
|
m[k] = v
|
|
}
|
|
m["job"] = job
|
|
m["__address__"] = target
|
|
m["__scheme__"] = scheme
|
|
m["__metrics_path__"] = metricsPath
|
|
for k, args := range params {
|
|
if len(args) == 0 {
|
|
continue
|
|
}
|
|
k = "__param_" + k
|
|
v := args[0]
|
|
m[k] = v
|
|
}
|
|
for k, v := range extraLabels {
|
|
m[k] = v
|
|
}
|
|
for k, v := range metaLabels {
|
|
m[k] = v
|
|
}
|
|
result := make([]prompbmarshal.Label, 0, len(m))
|
|
for k, v := range m {
|
|
result = append(result, prompbmarshal.Label{
|
|
Name: k,
|
|
Value: v,
|
|
})
|
|
}
|
|
return result
|
|
}
|
|
|
|
func getFilepath(baseDir, path string) string {
|
|
if filepath.IsAbs(path) {
|
|
return path
|
|
}
|
|
return filepath.Join(baseDir, path)
|
|
}
|
|
|
|
func addMissingPort(scheme, target string) string {
|
|
if strings.Contains(target, ":") {
|
|
return target
|
|
}
|
|
if scheme == "https" {
|
|
target += ":443"
|
|
} else {
|
|
target += ":80"
|
|
}
|
|
return target
|
|
}
|
|
|
|
const (
|
|
defaultScrapeInterval = time.Minute
|
|
defaultScrapeTimeout = 10 * time.Second
|
|
)
|