[release-6.5]fix(kubernetes_log source): fix VRL crashing on null (not exist) namespace_name when pod metadata annotation fails

[vparfonov]

Description

When Vector's kubernetes_logs source fails to annotate an event with pod metadata (e.g. pod already deleted), the kubernetes.namespace_name field is null, causing string!() to abort the remap transform.

Add fallback VRL logic that extracts kubernetes metadata (namespace, pod name, pod UID, container name) from the log file path, which is always available even when the Kubernetes API lookup fails. The file path format /var/log/pods/<ns>_<pod>_<uid>/<container>/<n>.log is parsed via regex.

Also use fallible string() with null coalescing in the match_any call as defense-in-depth in case the file path parsing also fails.

/cc @Clee2691
/assign @jcantrill

Links

• Depending on PR(s):
• GitHub issue:
• JIRA: https://redhat.atlassian.net/browse/LOG-9584
• Enhancement proposal:

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vparfonov
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[vparfonov]

/retest-required

[vparfonov]

/retest-required

[vparfonov]

/retest-required

[vparfonov]

/retest-required

[jcantrill]

/hold

[Clee2691]

/lgtm

[jcantrill]

@vparfonov lets find a time to discuss this. We should NEVER not have this base meta which is available from the file path. This failure is because it was purged. Maybe we just need fallback logic to extract it from the file or maybe this is a prime candidate for a vector enhancement.

[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

@vparfonov: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-target	4b92d01	link	true	/test e2e-target

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