Kiu/VictoriaMetrics
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docs: fix English and rm dupe sentence in README (#5523)

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@ -22,17 +22,17 @@ The cluster version of VictoriaMetrics is available [here](https://docs.victoria
Learn more about [key concepts](https://docs.victoriametrics.com/keyConcepts.html) of VictoriaMetrics and follow the
[quick start guide](https://docs.victoriametrics.com/Quick-Start.html) for a better experience.
There is also user-friendly database for logs - [VictoriaLogs](https://docs.victoriametrics.com/VictoriaLogs/).
There is also a user-friendly database for logs - [VictoriaLogs](https://docs.victoriametrics.com/VictoriaLogs/).
If you have questions about VictoriaMetrics, then feel free asking them at [VictoriaMetrics community Slack chat](https://slack.victoriametrics.com/).
If you have questions about VictoriaMetrics, then feel free asking them in the [VictoriaMetrics community Slack chat](https://slack.victoriametrics.com/).
[Contact us](mailto:info@victoriametrics.com) if you need enterprise support for VictoriaMetrics.
See [features available in enterprise package](https://docs.victoriametrics.com/enterprise.html).
Enterprise binaries can be downloaded and evaluated for free
from [the releases page](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/latest).
See how to request a free trial license [here](https://victoriametrics.com/products/enterprise/trial/).
You can also [request a free trial license](https://victoriametrics.com/products/enterprise/trial/).
VictoriaMetrics is developed at a fast pace, so it is recommended periodically checking the [CHANGELOG](https://docs.victoriametrics.com/CHANGELOG.html) and performing [regular upgrades](#how-to-upgrade-victoriametrics).
VictoriaMetrics is developed at a fast pace, so it is recommended to check the [CHANGELOG](https://docs.victoriametrics.com/CHANGELOG.html) periodically, and to perform [regular upgrades](#how-to-upgrade-victoriametrics).
VictoriaMetrics has achieved security certifications for Database Software Development and Software-Based Monitoring Services. We apply strict security measures in everything we do. See our [Security page](https://victoriametrics.com/security/) for more details.
@ -41,19 +41,19 @@ VictoriaMetrics has achieved security certifications for Database Software Devel
VictoriaMetrics has the following prominent features:
* It can be used as long-term storage for Prometheus. See [these docs](#prometheus-setup) for details.
* It can be used as a drop-in replacement for Prometheus in Grafana, because it supports [Prometheus querying API](#prometheus-querying-api-usage).
* It can be used as a drop-in replacement for Graphite in Grafana, because it supports [Graphite API](#graphite-api-usage).
* It can be used as a drop-in replacement for Prometheus in Grafana, because it supports the [Prometheus querying API](#prometheus-querying-api-usage).
* It can be used as a drop-in replacement for Graphite in Grafana, because it supports the [Graphite API](#graphite-api-usage).
VictoriaMetrics allows reducing infrastructure costs by more than 10x comparing to Graphite - see [this case study](https://docs.victoriametrics.com/CaseStudies.html#grammarly).
* It is easy to setup and operate:
* VictoriaMetrics consists of a single [small executable](https://medium.com/@valyala/stripping-dependency-bloat-in-victoriametrics-docker-image-983fb5912b0d)
without external dependencies.
* All the configuration is done via explicit command-line flags with reasonable defaults.
* All the data is stored in a single directory pointed by `-storageDataPath` command-line flag.
* All the data is stored in a single directory specified by the `-storageDataPath` command-line flag.
* Easy and fast backups from [instant snapshots](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282)
can be done with [vmbackup](https://docs.victoriametrics.com/vmbackup.html) / [vmrestore](https://docs.victoriametrics.com/vmrestore.html) tools.
See [this article](https://medium.com/@valyala/speeding-up-backups-for-big-time-series-databases-533c1a927883) for more details.
* It implements PromQL-like query language - [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html), which provides improved functionality on top of PromQL.
* It provides global query view. Multiple Prometheus instances or any other data sources may ingest data into VictoriaMetrics. Later this data may be queried via a single query.
* It implements a PromQL-like query language - [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html), which provides improved functionality on top of PromQL.
* It provides a global query view. Multiple Prometheus instances or any other data sources may ingest data into VictoriaMetrics. Later this data may be queried via a single query.
* It provides high performance and good vertical and horizontal scalability for both
[data ingestion](https://medium.com/@valyala/high-cardinality-tsdb-benchmarks-victoriametrics-vs-timescaledb-vs-influxdb-13e6ee64dd6b)
and [data querying](https://medium.com/@valyala/when-size-matters-benchmarking-victoriametrics-vs-timescale-and-influxdb-6035811952d4).
@ -62,9 +62,9 @@ VictoriaMetrics has the following prominent features:
and [up to 7x less RAM than Prometheus, Thanos or Cortex](https://valyala.medium.com/prometheus-vs-victoriametrics-benchmark-on-node-exporter-metrics-4ca29c75590f)
when dealing with millions of unique time series (aka [high cardinality](https://docs.victoriametrics.com/FAQ.html#what-is-high-cardinality)).
* It is optimized for time series with [high churn rate](https://docs.victoriametrics.com/FAQ.html#what-is-high-churn-rate).
* It provides high data compression, so up to 70x more data points may be stored into limited storage comparing to TimescaleDB
according to [these benchmarks](https://medium.com/@valyala/when-size-matters-benchmarking-victoriametrics-vs-timescale-and-influxdb-6035811952d4)
and up to 7x less storage space is required compared to Prometheus, Thanos or Cortex
* It provides high data compression: up to 70x more data points may be stored into limited storage compared with TimescaleDB
according to [these benchmarks](https://medium.com/@valyala/when-size-matters-benchmarking-victoriametrics-vs-timescale-and-influxdb-6035811952d4),
and up to 7x less storage space is required compared to Prometheus, Thanos or Cortex.
according to [this benchmark](https://valyala.medium.com/prometheus-vs-victoriametrics-benchmark-on-node-exporter-metrics-4ca29c75590f).
* It is optimized for storage with high-latency IO and low IOPS (HDD and network storage in AWS, Google Cloud, Microsoft Azure, etc).
See [disk IO graphs from these benchmarks](https://medium.com/@valyala/high-cardinality-tsdb-benchmarks-victoriametrics-vs-timescaledb-vs-influxdb-13e6ee64dd6b).
@ -75,7 +75,7 @@ VictoriaMetrics has the following prominent features:
from [PromCon 2019](https://promcon.io/2019-munich/talks/remote-write-storage-wars/).
* It protects the storage from data corruption on unclean shutdown (i.e. OOM, hardware reset or `kill -9`) thanks to
[the storage architecture](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
* It supports metrics' scraping, ingestion and [backfilling](#backfilling) via the following protocols:
* It supports metrics scraping, ingestion and [backfilling](#backfilling) via the following protocols:
* [Metrics scraping from Prometheus exporters](#how-to-scrape-prometheus-exporters-such-as-node-exporter).
* [Prometheus remote write API](#prometheus-setup).
* [Prometheus exposition format](#how-to-import-data-in-prometheus-exposition-format).
@ -95,7 +95,7 @@ VictoriaMetrics has the following prominent features:
[high churn rate](https://docs.victoriametrics.com/FAQ.html#what-is-high-churn-rate) issues via [series limiter](#cardinality-limiter).
* It ideally works with big amounts of time series data from APM, Kubernetes, IoT sensors, connected cars, industrial telemetry, financial data
and various [Enterprise workloads](https://docs.victoriametrics.com/enterprise.html).
* It has open source [cluster version](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/cluster).
* It has an open source [cluster version](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/cluster).
* It can store data on [NFS-based storages](https://en.wikipedia.org/wiki/Network_File_System) such as [Amazon EFS](https://aws.amazon.com/efs/)
and [Google Filestore](https://cloud.google.com/filestore).
@ -138,7 +138,7 @@ See also [articles and slides about VictoriaMetrics from our users](https://docs
### Install
To quickly try VictoriaMetrics, just download [VictoriaMetrics executable](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/latest)
To quickly try VictoriaMetrics, just download the [VictoriaMetrics executable](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/latest)
or [Docker image](https://hub.docker.com/r/victoriametrics/victoria-metrics/) and start it with the desired command-line flags.
See also [QuickStart guide](https://docs.victoriametrics.com/Quick-Start.html) for additional information.
@ -155,10 +155,10 @@ VictoriaMetrics can also be installed via these installation methods:
The following command-line flags are used the most:
* `-storageDataPath` - VictoriaMetrics stores all the data in this directory. Default path is `victoria-metrics-data` in the current working directory.
* `-storageDataPath` - VictoriaMetrics stores all the data in this directory. The default path is `victoria-metrics-data` in the current working directory.
* `-retentionPeriod` - retention for stored data. Older data is automatically deleted. Default retention is 1 month (31 days). The minimum retention period is 24h or 1d. See [these docs](#retention) for more details.
Other flags have good enough default values, so set them only if you really need this. Pass `-help` to see [all the available flags with description and default values](#list-of-command-line-flags).
Other flags have good enough default values, so set them only if you really need to. Pass `-help` to see [all the available flags with description and default values](#list-of-command-line-flags).
The following docs may be useful during initial VictoriaMetrics setup:
* [How to set up scraping of Prometheus-compatible targets](https://docs.victoriametrics.com/#how-to-scrape-prometheus-exporters-such-as-node-exporter)
@ -172,9 +172,6 @@ VictoriaMetrics accepts [Prometheus querying API requests](#prometheus-querying-
It is recommended setting up [monitoring](#monitoring) for VictoriaMetrics.
VictoriaMetrics is developed at a fast pace, so it is recommended periodically checking the [CHANGELOG](https://docs.victoriametrics.com/CHANGELOG.html) and performing [regular upgrades](#how-to-upgrade-victoriametrics).
### Environment variables
All the VictoriaMetrics components allow referring environment variables in `yaml` configuration files (such as `-promscrape.config`)