docs: update to cover nfd-gc

docs/get-started/introduction.md

@@ -26,7 +26,7 @@ NFD consists of four software components:
 1. nfd-master
 1. nfd-worker
 1. nfd-topology-updater
-1. nfd-topology-gc
+1. nfd-gc
 
 ## NFD-Master
 
@@ -50,13 +50,13 @@ creates or updates a
 resource object specific to this node. One instance of nfd-topology-updater is
 supposed to be running on each node of the cluster.
 
-## NFD-Topology-GC
+## NFD-GC
 
-NFD-Topology-GC is a daemon responsible for cleaning obsolete
-[NodeResourceTopology](../usage/custom-resources.md#noderesourcetopology) objects,
-obsolete means that there is no corresponding worker node.
+NFD-GC is a daemon responsible for cleaning obsolete
+[NodeFeature](../usage/custom-resources.md#nodefeature) and
+[NodeResourceTopology](../usage/custom-resources.md#noderesourcetopology) objects.
 
-One instance of nfd-topology-gc is supposed to be running in the cluster.
+One instance of nfd-gc is supposed to be running in the cluster.
 
 ## Feature Discovery
 

docs/reference/topology-gc-commandline-reference.md → docs/reference/gc-commandline-reference.md

@@ -1,10 +1,10 @@
 ---
-title: "Topology Garbage Collector Cmdline Reference"
+title: "Garbage Collector Cmdline Reference"
 layout: default
 sort: 7
 ---
 
-# NFD-Topology-Garbage-Collector Commandline Flags
+# NFD-GC Commandline Flags
 {: .no_toc }
 
 ## Table of Contents
@@ -15,12 +15,12 @@ sort: 7
 
 ---
 
-To quickly view available command line flags execute `nfd-topology-gc -help`.
+To quickly view available command line flags execute `nfd-gc -help`.
 In a docker container:
 
 ```bash
 docker run {{ site.container_image }} \
-nfd-topology-gc -help
+nfd-gc -help
 ```
 
 ### -h, -help
@@ -40,5 +40,5 @@ Default: 1h
 Example:
 
 ```bash
-nfd-topology-gc -gc-interval=1h
+nfd-gc -gc-interval=1h
 ```

docs/usage/nfd-gc.md

@@ -0,0 +1,30 @@
+---
+title: "NFD-Garbage-Collector"
+layout: default
+sort: 6
+---
+
+# NFD-GC
+{: .no_toc}
+
+---
+
+NFD-GC (NFD Garbage-Collector) is preferably run as a Kubernetes deployment
+with one replica. It makes sure that all
+[NodeFeature](custom-resources.md#nodefeature) and
+[NodeResourceTopology](custom-resources.md#noderesourcetopology) objects
+have corresponding nodes and removes stale objects for non-existent nodes.
+
+The daemon watches for Node deletion events and removes NodeFeature and
+NodeResourceTopology objects upon them. It also runs periodically to make sure
+no node delete event was missed and to remove any NodeFeature or
+NodeResourceTopology objects that were created without corresponding node. The
+default garbage collector interval is set to 1h which is the value when no
+-gc-interval is specified.
+
+## Configuration
+
+In Helm deployments (see
+[garbage collector parameters](../deployment/helm.md#garbage-collector-parameters))
+NFD-GC will only be deployed when `enableNodeFeatureApi` or
+`topologyUpdater.enable` is set to true.