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docs: describe nfd-topology-gc in introduction.md

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Signed-off-by: yanggang <gang.yang@daocloud.io>
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@ -19,11 +19,12 @@ This software enables node feature discovery for Kubernetes. It detects
hardware features available on each node in a Kubernetes cluster, and hardware features available on each node in a Kubernetes cluster, and
advertises those features using node labels and optionally node taints. advertises those features using node labels and optionally node taints.
NFD consists of three software components: NFD consists of four software components:
1. nfd-master 1. nfd-master
1. nfd-worker 1. nfd-worker
1. nfd-topology-updater 1. nfd-topology-updater
1. nfd-topology-gc
## NFD-Master ## NFD-Master
@ -47,9 +48,9 @@ creates or updates a
resource object specific to this node. One instance of nfd-topology-updater is resource object specific to this node. One instance of nfd-topology-updater is
supposed to be running on each node of the cluster. supposed to be running on each node of the cluster.
## NFD-Topology-Garbage-Collector ## NFD-Topology-GC
NFD-Topology-Garbage-Collector is a daemon responsible for cleaning obsolete NFD-Topology-GC is a daemon responsible for cleaning obsolete
[NodeResourceTopology](../usage/custom-resources.md#noderesourcetopology) objects, [NodeResourceTopology](../usage/custom-resources.md#noderesourcetopology) objects,
obsolete means that there is no corresponding worker node. obsolete means that there is no corresponding worker node.