Add Kubernetes metadata

The add_kubernetes_metadata processor annotates each event with relevant metadata based on which Kubernetes pod the event originated from. At startup it detects an in_cluster environment and caches the Kubernetes-related metadata. Events are only annotated if a valid configuration is detected. If it’s not able to detect a valid Kubernetes configuration, the events are not annotated with Kubernetes-related metadata.

Each event is annotated with:

The add_kubernetes_metadata processor has two basic building blocks which are:

Indexers take in a pod’s metadata and builds indices based on the pod metadata. For example, the ip_port indexer can take a Kubernetes pod and index the pod metadata based on all pod_ip:container_port combinations.

Matchers are used to construct lookup keys for querying indices. For example, when the fields matcher takes ["metricset.host"] as a lookup field, it would construct a lookup key with the value of the field metricset.host.

Each Beat can define its own default indexers and matchers which are enabled by default. For example, FileBeat enables the container indexer, which indexes pod metadata based on all container IDs, and a logs_path matcher, which takes the log.file.path field, extracts the container ID, and uses it to retrieve metadata.

The configuration below enables the processor when functionbeat is run as a pod in Kubernetes.

processors:
- add_kubernetes_metadata:

The configuration below enables the processor on a Beat running as a process on the Kubernetes node.

processors:
- add_kubernetes_metadata:
    host: <hostname>
    # If kube_config is not set, KUBECONFIG environment variable will be checked
    # and if not present it will fall back to InCluster
    kube_config: ${HOME}/.kube/config

The configuration below has the default indexers and matchers disabled and enables ones that the user is interested in.

processors:
- add_kubernetes_metadata:
    host: <hostname>
    # If kube_config is not set, KUBECONFIG environment variable will be checked
    # and if not present it will fall back to InCluster
    kube_config: ~/.kube/config
    default_indexers.enabled: false
    default_matchers.enabled: false
    indexers:
      - ip_port:
    matchers:
      - fields:
          lookup_fields: ["metricset.host"]

The add_kubernetes_metadata processor has the following configuration settings: