[release-v1.46] Adjust the path to the shoot CA certificate in the blackbox exporter #5948
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The blackbox exporter, which is running as a sidecar of the prometheus in the shoot control plane namespace is used to probe the shoot api server via its external endpoint. See the red path in the documentation: https://github.com/gardener/gardener/blob/dc1abd68d3e04679cf810d86086611cbbefa0a66/docs/monitoring/connectivity.md The TLS connection to the api server does not work which results in false positive alerts: "ApiServerNotReachable". The underlying error message is: ``` unable to load specified CA cert /var/run/secrets/shoot-ca/ca.crt: open /var/run/secrets/shoot-ca/ca.crt: no such file or directory ``` The blackbox exporter does not have access to the CA certificate that it needs to verify the certificate of the shoot API server, and hence the TLS connection fails. This issue is related to the CA rotation epic, which introduced a different name for the certificate to support the rotation process. The path is pointing to this volume: https://github.com/gardener/gardener/blob/dc1abd68d3e04679cf810d86086611cbbefa0a66/charts/seed-monitoring/charts/core/charts/prometheus/templates/prometheus.yaml#L196 where the file name changed from "ca.crt" to "bundle.crt". Co-authored-by: Wesley Bermbach <wesley.bermbach@sap.com> Co-authored-by: Istvan Zoltan Ballok <istvan.zoltan.ballok@sap.com>
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: rfranzke The full list of commands accepted by this bot can be found here. The pull request process is described here
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This is an automated cherry-pick of #5947
/assign rfranzke