[kube-prometheus-stack] Add support for alertmanager cluster.label #4877
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What this PR does / why we need it
This exposes the
cluster.label
option for alertmanager. This allows us to resolve prometheus/alertmanager#2250 (added in prometheus/alertmanager#3354).The
clusterLabel
is supported by the CRD here: https://github.com/prometheus-community/helm-charts/blob/main/charts/prometheus-operator-crds/charts/crds/templates/crd-alertmanagers.yaml#L2094Special notes for your reviewer
None
Checklist
[prometheus-couchdb-exporter]
)