Add status.last_terminated_exitcode field in state_container metricset

[MichaelKatsoulis]

Proposed commit message

• WHAT: populate field status.last_terminated_exitcode in kubernetes.state_container metricset
• WHY: track container termination reasons more accurately

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

Disruptive User Impact

None

How to test this PR locally

1. Create a GKE kubernetes cluster
2. Install kube-state-metrics (tested will all supported versions)
3. Run metricbeat in k8s pod with all state-* metricsets configured. https://github.com/elastic/beats/blob/main/metricbeat/module/kubernetes/_meta/test/docs/README.md
4. Create a pod that crashes with a status code. For example

apiVersion: v1
kind: Pod
metadata:
  name: failpodloop
  namespace: default
spec:
  restartPolicy: Always
  containers:
  - name: fail
    image: busybox
    command: ['sh', '-c', 'sleep 2 && exit 42']  # Runs, exits with 42, then restarts

5. Check Kibana discovery for fields present in kubernetes.state_container metricset.

Related issues

• Closes [Kubernetes module] Populate kube_pod_container_status_last_terminated_exitcode #47642

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @MichaelKatsoulis? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[github-actions]

🔍 Preview links for changed docs

• docs/reference/metricbeat/exported-fields-kubernetes.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_container.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_cronjob.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_daemonset.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_deployment.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_horizontalpodautoscaler.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_job.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_node.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_persistentvolumeclaim.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_pod.md

More links …

• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_replicaset.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_resourcequota.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_service.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_statefulset.md
• docs/reference/metricbeat/metricbeat-metricset-kubernetes-state_storageclass.md

[theletterf]

LGTM.

[github-actions]

@Mergifyio backport 9.1 9.2

[mergify]

backport 9.1 9.2

✅ Backports have been created

Details

• #48047 [9.1](backport #47968) Add status.last_terminated_exitcode field in state_container metricset has been created for branch 9.1
• #48048 [9.2](backport #47968) Add status.last_terminated_exitcode field in state_container metricset has been created for branch 9.2