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diff --git a/docs/cloud/netdata-functions.md b/docs/cloud/netdata-functions.md new file mode 100644 index 00000000..caff9b35 --- /dev/null +++ b/docs/cloud/netdata-functions.md @@ -0,0 +1,79 @@ +<!-- +title: "Netdata Functions" +sidebar_label: "Netdata Functions" +custom_edit_url: "https://github.com/netdata/netdata/blob/master/docs/cloud/netdata-functions.md" +sidebar_position: "2800" +learn_status: "Published" +learn_topic_type: "Concepts" +learn_rel_path: "Concepts" +learn_docs_purpose: "Present the Netdata Functions what these are and why they should be used." +--> + +# Netdata Functions + +Netdata Agent collectors are able to expose functions that can be executed in run-time and on-demand. These will be +executed on the node - host where the function is made +available. + +#### What is a function? + +Collectors besides the metric collection, storing, and/or streaming work are capable of executing specific routines on +request. These routines will bring additional information +to help you troubleshoot or even trigger some action to happen on the node itself. + +A function is a `key` - `value` pair. The `key` uniquely identifies the function within a node. The `value` is a +function (i.e. code) to be run by a data collector when +the function is invoked. + +For more details please check out documentation on how we use our internal collector to get this from the first collector that exposes +functions - [plugins.d](https://github.com/netdata/netdata/blob/master/collectors/plugins.d/README.md#function). + +#### What functions are currently available? + +| Function | Description | Alternative to CLI tools | plugin - module | +|:-------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------|:-----------------------------------------------------------------------------------------------------------| +| block-devices | Disk I/O activity for all block devices, offering insights into both data transfer volume and operation performance. | `iostat` | [proc](https://github.com/netdata/netdata/tree/master/collectors/proc.plugin#readme) | +| containers-vms | Insights into the resource utilization of containers and QEMU virtual machines: CPU usage, memory consumption, disk I/O, and network traffic. | `docker stats`, `systemd-cgtop` | [cgroups](https://github.com/netdata/netdata/tree/master/collectors/cgroups.plugin#readme) | +| ipmi-sensors | Readings and status of IPMI sensors. | `ipmi-sensors` | [freeipmi](https://github.com/netdata/netdata/tree/master/collectors/freeipmi.plugin#readme) | +| mount-points | Disk usage for each mount point, including used and available space, both in terms of percentage and actual bytes, as well as used and available inode counts. | `df` | [diskspace](https://github.com/netdata/netdata/tree/master/collectors/diskspace.plugin#readme) | +| network interfaces | Network traffic, packet drop rates, interface states, MTU, speed, and duplex mode for all network interfaces. | `bmon`, `bwm-ng` | [proc](https://github.com/netdata/netdata/tree/master/collectors/proc.plugin#readme) | +| processes | Real-time information about the system's resource usage, including CPU utilization, memory consumption, and disk IO for every running process. | `top`, `htop` | [apps](https://github.com/netdata/netdata/blob/master/collectors/apps.plugin/README.md) | +| systemd-journal | Viewing, exploring and analyzing systemd journal logs. | `journalctl` | [systemd-journal](https://github.com/netdata/netdata/tree/master/collectors/systemd-journal.plugin#readme) | +| systemd-list-units | Information about all systemd units, including their active state, description, whether or not they are enabled, and more. | `systemctl list-units` | [systemd-journal](https://github.com/netdata/netdata/tree/master/collectors/systemd-journal.plugin#readme) | +| systemd-services | System resource utilization for all running systemd services: CPU, memory, and disk IO. | `systemd-cgtop` | [cgroups](https://github.com/netdata/netdata/tree/master/collectors/cgroups.plugin#readme) | +| streaming | Comprehensive overview of all Netdata children instances, offering detailed information about their status, replication completion time, and many more. | | | + + +If you have ideas or requests for other functions: +* Participate in the relevant [GitHub discussion](https://github.com/netdata/netdata/discussions/14412) +* Open a [feature request](https://github.com/netdata/netdata-cloud/issues/new?assignees=&labels=feature+request%2Cneeds+triage&template=FEAT_REQUEST.yml&title=%5BFeat%5D%3A+) on Netdata Cloud repo +* Join the Netdata community on [Discord](https://discord.com/invite/mPZ6WZKKG2) and let us know. + +#### How do functions work with streaming? + +Via streaming, the definitions of functions are transmitted to a parent node, so it knows all the functions available on +any children connected to it. + +If the parent node is the one connected to Netdata Cloud it is capable of triggering the call to the respective children +node to run the function. + +#### Why are they available only on Netdata Cloud? + +Since these functions are able to execute routines on the node and due to the potential use cases that they can cover, our +concern is to ensure no sensitive +information or disruptive actions are exposed through the Agent's API. + +With the communication between the Netdata Agent and Netdata Cloud being +through [ACLK](https://github.com/netdata/netdata/blob/master/aclk/README.md) this +concern is addressed. + +## Related Topics + +### **Related Concepts** + +- [ACLK](https://github.com/netdata/netdata/blob/master/aclk/README.md) +- [plugins.d](https://github.com/netdata/netdata/blob/master/collectors/plugins.d/README.md) + +### Related Tasks + +- [Run-time troubleshooting with Functions](https://github.com/netdata/netdata/blob/master/docs/cloud/runtime-troubleshooting-with-functions.md) |