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fix: add liveness probe for metadata-envoy-deployment #191

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Resolves #187

This PR adds a liveness probe to the Deployment/metadata-envoy-deployment Pods. It seems like sometimes this deployment can be running but not functional, resulting in Cannot get MLMD objects from Metadata store errors when running V2 Kubeflow Pipelines:

This was uncovered in canonical/bundle-kubeflow#966 (comment).

Signed-off-by: Mathew Wicks <5735406+thesuperzapper@users.noreply.github.com>
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orfeas-k commented Aug 7, 2024

@thesuperzapper what version of envoy is being used here? The referenced livenessProbe in canonical/envoy-operator#124 works for 1.12 IIRC (aka pipelines 2.0). When we bumped envoy to 1.27 (pipelines 2.2.0), we hit the issue described in canonical/envoy-operator#106 where

curl <envoy-pod-ip>:9090 -H 'Content-Type: application/grpc-web-text' -v                                       

returns a 503. Have you checked that this returns a proper 2XX code?

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Cannot get MLMD objects from Metadata store.
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