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docs/FAQ.md: re-order questions to be more attractive to visitors

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@ -19,11 +19,30 @@ See [case studies](https://docs.victoriametrics.com/CaseStudies.html).
See [these docs](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#prominent-features).
### Are there performance comparisons with other solutions?
Yes. See [these benchmarks](https://docs.victoriametrics.com/Articles.html#benchmarks).
### How to start using VictoriaMetrics?
See [these docs](https://docs.victoriametrics.com/Quick-Start.html).
### Does VictoriaMetrics support replication?
Yes. See [these docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#replication-and-data-safety) for details.
### Can I use VictoriaMetrics instead of Prometheus?
Yes in most cases. VictoriaMetrics can substitute Prometheus in the following aspects:
* Prometheus-compatible service discovery and target scraping can be done with [vmagent](https://docs.victoriametrics.com/vmagent.html) and with single-node VictoriaMetrics - see [these docs](https://docs.victoriametrics.com/#how-to-scrape-prometheus-exporters-such-as-node-exporter).
* Prometheus-compatible alerting rules and recording rules can be processed with [vmalert](https://docs.victoriametrics.com/vmalert.html).
* Prometheus-compatible querying in Grafana is supported by VictoriaMetrics. See [these docs](https://docs.victoriametrics.com/#grafana-setup).
### What is the difference between vmagent and Prometheus?
While both [vmagent](https://docs.victoriametrics.com/vmagent.html) and Prometheus may scrape Prometheus targets (aka `/metrics` pages)
@ -141,23 +160,6 @@ No. VictoriaMetrics core is written in Go from scratch by [fasthttp](https://git
The architecture is [optimized for storing and querying large amounts of time series data with high cardinality](https://medium.com/devopslinks/victoriametrics-creating-the-best-remote-storage-for-prometheus-5d92d66787ac). VictoriaMetrics storage uses [certain ideas from ClickHouse](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282). Special thanks to [Alexey Milovidov](https://github.com/alexey-milovidov).
### Are there performance comparisons with other solutions?
Yes:
* [Prometheus vs VictoriaMetrics benchmark on node-exporter metrics](https://valyala.medium.com/prometheus-vs-victoriametrics-benchmark-on-node-exporter-metrics-4ca29c75590f)
* [Promscale vs VictoriaMetrics: measuring resource usage in production](https://valyala.medium.com/promscale-vs-victoriametrics-resource-usage-on-production-workload-91c8e3786c03)
* [Benchmarking time series workloads on Apache Kudu using TSBS](https://blog.cloudera.com/benchmarking-time-series-workloads-on-apache-kudu-using-tsbs/)
* [Billy: how VictoriaMetrics deals with more than 500 billion rows](https://medium.com/@valyala/billy-how-victoriametrics-deals-with-more-than-500-billion-rows-e82ff8f725da)
* [Measuring vertical scalability for time series databases: VictoriaMetrics vs InfluxDB vs TimescaleDB](https://medium.com/@valyala/measuring-vertical-scalability-for-time-series-databases-in-google-cloud-92550d78d8ae).
* [Measuring insert performance on high-cardinality time series: VictoriaMetrics vs InfluxDB](https://medium.com/@valyala/insert-benchmarks-with-inch-influxdb-vs-victoriametrics-e31a41ae2893)
* [TSBS benchmark on high-cardinality time series: VictoriaMetrics vs InfluxDB vs TimescaleDB](https://medium.com/@valyala/high-cardinality-tsdb-benchmarks-victoriametrics-vs-timescaledb-vs-influxdb-13e6ee64dd6b)
* [Standard TSBS benchmark: VictoriaMetrics vs InfluxDB vs TimescaleDB](https://medium.com/@valyala/when-size-matters-benchmarking-victoriametrics-vs-timescale-and-influxdb-6035811952d4)
See also [other articles about VictoriaMetrics](https://docs.victoriametrics.com/Articles.html).
### What is the pricing for VictoriaMetrics?
The following versions are open source and free:
@ -189,11 +191,6 @@ or via [Prometheus datasource in Grafana](https://docs.victoriametrics.com/#graf
Yes. See [these docs](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication) for details.
### Does VictoriaMetrics support replication?
Yes. See [these docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#replication-and-data-safety) for details.
### Where is the source code of VictoriaMetrics?
Source code for the following versions is available in the following places:
@ -225,7 +222,7 @@ File bugs and feature requests [here](https://github.com/VictoriaMetrics/Victori
### Where I can find information about multi-tenancy?
See more details about multi-tenancy [here](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenancy). Please note, this feature is supported only by [cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) version of VictoriaMetrics.
See [these docs](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenancy). Multitenancy is supported only by [cluster version](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) of VictoriaMetrics.
### How to set a memory limit for VictoriaMetrics components?
@ -240,15 +237,11 @@ Memory usage for VictoriaMetrics components can be tuned according to the follow
* [Troubleshooting for single-node VictoriaMetrics](https://docs.victoriametrics.com/#troubleshooting)
### Can I use VictoriaMetrics instead of Prometheus?
Yes in most cases. VictoriaMetrics can substitute Prometheus in the following aspects:
* Prometheus-compatible service discovery and target scraping can be done with [vmagent](https://docs.victoriametrics.com/vmagent.html) and with single-node VictoriaMetrics - see [these docs](https://docs.victoriametrics.com/#how-to-scrape-prometheus-exporters-such-as-node-exporter).
* Prometheus-compatible alerting rules and recording rules can be processed with [vmalert](https://docs.victoriametrics.com/vmalert.html).
* Prometheus-compatible querying in Grafana is supported by VictoriaMetrics. See [these docs](https://docs.victoriametrics.com/#grafana-setup).
### How can I run VictoriaMetrics on FreeBSD?
VictoriaMetrics is included in FreeBSD ports, so just install it from there. See [this link](https://www.freebsd.org/cgi/ports.cgi?query=victoria&stype=all).
### Does VictoriaMetrics support Graphite query language?
Yes. See [these docs](https://docs.victoriametrics.com/#graphite-api-usage).