Adding upstream version 1.46.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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-# How to optimize the Netdata Agent's performance
-
-We designed the Netdata Agent to be incredibly lightweight, even when it's collecting a few thousand dimensions every
-second and visualizing that data into hundreds of charts. However, the default settings of the Netdata Agent are not 
-optimized for performance, but for a simple, standalone setup. We want the first install to give you something you can 
-run without any configuration. Most of the settings and options are enabled, since we want you to experience the full thing.
-
-By default, Netdata will automatically detect applications running on the node it is installed to start collecting metrics in 
-real-time, has health monitoring enabled to evaluate alerts and trains Machine Learning (ML) models for each metric, to detect anomalies.
-
-This document describes the resources required for the various default capabilities and the strategies to optimize Netdata for production use. 
-
-## Summary of performance optimizations
-
-The following table summarizes the effect of each optimization on the CPU, RAM and Disk IO utilization in production.
-
-Optimization | CPU | RAM | Disk IO
--- | -- | -- |--
-[Use streaming and replication](#use-streaming-and-replication) | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark:
-[Disable unneeded plugins or collectors](#disable-unneeded-plugins-or-collectors) | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark:
-[Reduce data collection frequency](#reduce-collection-frequency) | :heavy_check_mark: | | :heavy_check_mark:
-[Change how long Netdata stores metrics](https://github.com/netdata/netdata/blob/master/docs/store/change-metrics-storage.md) | | :heavy_check_mark: | :heavy_check_mark:
-[Use a different metric storage database](https://github.com/netdata/netdata/blob/master/database/README.md) | | :heavy_check_mark: | :heavy_check_mark:
-[Disable machine learning](#disable-machine-learning) | :heavy_check_mark: | | 
-[Use a reverse proxy](#run-netdata-behind-a-proxy) | :heavy_check_mark: | | 
-[Disable/lower gzip compression for the agent dashboard](#disablelower-gzip-compression-for-the-dashboard) | :heavy_check_mark: | | 
-
-## Resources required by a default Netdata installation
-
-Netdata's performance is primarily affected by **data collection/retention** and **clients accessing data**. 
-
-You can configure almost all aspects of data collection/retention, and certain aspects of clients accessing data. 
-
-### CPU consumption
-
-Expect about:
- - 1-3% of a single core for the netdata core
- - 1-3% of a single core for the various collectors (e.g. go.d.plugin, apps.plugin)
- - 5-10% of a single core, when ML training runs
-
-Your experience may vary depending on the number of metrics collected, the collectors enabled and the specific environment they 
-run on, i.e. the work they have to do to collect these metrics.
-
-As a general rule, for modern hardware and VMs, the total CPU consumption of a standalone Netdata installation, including all its components, 
-should be below 5 - 15% of a single core. For example, on 8 core server it will use only 0.6% - 1.8% of a total CPU capacity, depending on 
-the CPU characteristics.
-
-The Netdata Agent runs with the lowest possible [process scheduling policy](https://github.com/netdata/netdata/blob/master/daemon/README.md#netdata-process-scheduling-policy), which is `nice 19`, and uses the `idle` process scheduler.
-Together, these settings ensure that the Agent only gets CPU resources when the node has CPU resources to space. If the
-node reaches 100% CPU utilization, the Agent is stopped first to ensure your applications get any available resources.
-
-To reduce CPU usage you can [disable machine learning](#disable-machine-learning), 
-[use streaming and replication](#use-streaming-and-replication),
-[reduce the data collection frequency](#reduce-collection-frequency), [disable unneeded plugins or collectors](#disable-unneeded-plugins-or-collectors), [use a reverse proxy](#run-netdata-behind-a-proxy), and [disable/lower gzip compression for the agent dashboard](#disablelower-gzip-compression-for-the-dashboard).
-
-### Memory consumption
-
-The memory footprint of Netdata is mainly influenced by the number of metrics concurrently being collected. Expect about 150MB of RAM for a typical 64-bit server collecting about 2000 to 3000 metrics.
-
-To estimate and control memory consumption, you can [disable unneeded plugins or collectors](#disable-unneeded-plugins-or-collectors), [change how long Netdata stores metrics](https://github.com/netdata/netdata/blob/master/docs/store/change-metrics-storage.md), or [use a different metric storage database](https://github.com/netdata/netdata/blob/master/database/README.md).
-
-
-### Disk footprint and I/O
-
-By default, Netdata should not use more than 1GB of disk space, most of which is dedicated for storing metric data and metadata. For typical installations collecting 2000 - 3000 metrics, this storage should provide a few days of high-resolution retention (per second), about a month of mid-resolution retention (per minute) and more than a year of low-resolution retention (per hour).
-
-Netdata spreads I/O operations across time. For typical standalone installations there should be a few write operations every 5-10 seconds of a few kilobytes each, occasionally up to 1MB. In addition, under heavy load, collectors that require disk I/O may stop and show gaps in charts.
-
-To configure retention, you can [change how long Netdata stores metrics](https://github.com/netdata/netdata/blob/master/docs/store/change-metrics-storage.md).
-To control disk I/O [use a different metric storage database](https://github.com/netdata/netdata/blob/master/database/README.md), avoid querying the 
-production system [using streaming and replication](#use-streaming-and-replication), [reduce the data collection frequency](#reduce-collection-frequency), and [disable unneeded plugins or collectors](#disable-unneeded-plugins-or-collectors).
-
-## Use streaming and replication
-
-For all production environments, parent Netdata nodes outside the production infrastructure should be receiving all 
-collected data from children Netdata nodes running on the production infrastructure, using [streaming and replication](https://github.com/netdata/netdata/blob/master/docs/metrics-storage-management/enable-streaming.md).
-
-### Disable health checks on the child nodes
-
-When you set up streaming, we recommend you run your health checks on the parent. This saves resources on the children 
-and makes it easier to configure or disable alerts and agent notifications.
-
-The parents by default run health checks for each child, as long as the child is connected (the details are in `stream.conf`). 
-On the child nodes you should add to `netdata.conf` the following:
-
-```conf
-[health]
-   enabled = no
-```
-
-### Use memory mode ram or save for the child nodes
-
-See [using a different metric storage database](https://github.com/netdata/netdata/blob/master/database/README.md).
-
-## Disable unneeded plugins or collectors
-
-If you know that you don't need an [entire plugin or a specific
-collector](https://github.com/netdata/netdata/blob/master/collectors/README.md#collector-architecture-and-terminology), you can disable any of them.
-Keep in mind that if a plugin/collector has nothing to do, it simply shuts down and does not consume system resources.
-You will only improve the Agent's performance by disabling plugins/collectors that are actively collecting metrics.
-
-Open `netdata.conf` and scroll down to the `[plugins]` section. To disable any plugin, uncomment it and set the value to
-`no`. For example, to explicitly keep the `proc` and `go.d` plugins enabled while disabling `python.d` and `charts.d`.
-
-```conf
-[plugins]
-    proc = yes
-	python.d = no
-	charts.d = no
-	go.d = yes
-```
-
-Disable specific collectors by opening their respective plugin configuration files, uncommenting the line for the
-collector, and setting its value to `no`.
-
-```bash
-sudo ./edit-config go.d.conf
-sudo ./edit-config python.d.conf
-sudo ./edit-config charts.d.conf
-```
-
-For example, to disable a few Python collectors:
-
-```conf
-modules:
-  apache: no
-	dockerd: no
-	fail2ban: no
-```
-
-## Reduce collection frequency
-
-The fastest way to improve the Agent's resource utilization is to reduce how often it collects metrics.
-
-### Global
-
-If you don't need per-second metrics, or if the Netdata Agent uses a lot of CPU even when no one is viewing that node's
-dashboard, [configure the Agent](https://github.com/netdata/netdata/blob/master/docs/configure/nodes.md) to collect metrics less often.
-
-Open `netdata.conf` and edit the `update every` setting. The default is `1`, meaning that the Agent collects metrics
-every second.
-
-If you change this to `2`, Netdata enforces a minimum `update every` setting of 2 seconds, and collects metrics every
-other second, which will effectively halve CPU utilization. Set this to `5` or `10` to collect metrics every 5 or 10
-seconds, respectively.
-
-```conf
-[global]
-    update every = 5
-```
-
-### Specific plugin or collector
-
-Every collector and plugin has its own `update every` setting, which you can also change in the `go.d.conf`,
-`python.d.conf`, or `charts.d.conf` files, or in individual collector configuration files. If the `update
-every` for an individual collector is less than the global, the Netdata Agent uses the global setting. See the [collectors configuration reference](https://github.com/netdata/netdata/blob/master/collectors/REFERENCE.md) for details.
-
-To reduce the frequency of an [internal
-plugin/collector](https://github.com/netdata/netdata/blob/master/collectors/README.md#collector-architecture-and-terminology), open `netdata.conf` and
-find the appropriate section. For example, to reduce the frequency of the `apps` plugin, which collects and visualizes
-metrics on application resource utilization:
-
-```conf
-[plugin:apps]
-    update every = 5
-```
-
-To [configure an individual collector](https://github.com/netdata/netdata/blob/master/collectors/REFERENCE.md#configure-a-collector), open its specific configuration file with
-`edit-config` and look for the `update_every` setting. For example, to reduce the frequency of the `nginx` collector,
-run `sudo ./edit-config go.d/nginx.conf`:
-
-```conf
-# [ GLOBAL ]
-update_every: 10
-```
-
-## Lower memory usage for metrics retention
-
-See how to [change how long Netdata stores metrics](https://github.com/netdata/netdata/blob/master/docs/store/change-metrics-storage.md).
-
-## Use a different metric storage database
-
-Consider [using a different metric storage database](https://github.com/netdata/netdata/blob/master/database/README.md) when running Netdata on IoT devices,
-and for children in a parent-child set up based on [streaming and replication](https://github.com/netdata/netdata/blob/master/docs/metrics-storage-management/enable-streaming.md).
-
-## Disable machine learning
-
-Automated anomaly detection may be a powerful tool, but we recommend it to only be enabled on Netdata parents 
-that sit outside your production infrastructure, or if you have cpu and memory to spare. You can disable ML 
-with the following:
-
-```conf
-[ml]
-   enabled = no
-```
-   
-## Run Netdata behind a proxy
-
-A dedicated web server like nginx provides more robustness than the Agent's internal [web server](https://github.com/netdata/netdata/blob/master/web/README.md).
-Nginx can handle more concurrent connections, reuse idle connections, and use fast gzip compression to reduce payloads.
-
-For details on installing another web server as a proxy for the local Agent dashboard, see [reverse proxies](https://github.com/netdata/netdata/blob/master/docs/category-overview-pages/reverse-proxies.md).
-
-## Disable/lower gzip compression for the dashboard
-
-If you choose not to run the Agent behind Nginx, you can disable or lower the Agent's web server's gzip compression.
-While gzip compression does reduce the size of the HTML/CSS/JS payload, it does use additional CPU while a user is
-looking at the local Agent dashboard.
-
-To disable gzip compression, open `netdata.conf` and find the `[web]` section:
-
-```conf
-[web]
-    enable gzip compression = no
-```
-
-Or to lower the default compression level:
-
-```conf
-[web]
-    enable gzip compression = yes
-    gzip compression level = 1
-```
-