[ACM-13481] - Remove HA mode when AM has one replica

[coleenquadros]

https://issues.redhat.com/browse/ACM-13481

This is a workaround/hack when AM replicas are set to 1 and are no more in HA mode. prometheus/alertmanager#1971

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[openshift-ci]

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ci/prow/test-e2e	2ec5103	link	true	/test test-e2e

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[coleenquadros]

/cherrypick release-2.12

[openshift-cherrypick-robot]

@coleenquadros: once the present PR merges, I will cherry-pick it on top of release-2.12 in a new PR and assign it to you.

In response to this:

/cherrypick release-2.12

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[coleenquadros]

/cherrypick release-2.11

[openshift-cherrypick-robot]

@coleenquadros: once the present PR merges, I will cherry-pick it on top of release-2.11 in a new PR and assign it to you.

In response to this:

/cherrypick release-2.11

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[philipgough]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: coleenquadros, philipgough

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[openshift-cherrypick-robot]

@coleenquadros: new pull request created: #1701

In response to this:

/cherrypick release-2.12

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[openshift-cherrypick-robot]

@coleenquadros: #1700 failed to apply on top of branch "release-2.11":

Applying: remove HA mode when AM has one replica
Using index info to reconstruct a base tree...
M	operators/multiclusterobservability/manifests/base/alertmanager/alertmanager-statefulset.yaml
M	operators/multiclusterobservability/pkg/rendering/renderer_alertmanager.go
M	operators/multiclusterobservability/pkg/rendering/renderer_alertmanager_test.go
Falling back to patching base and 3-way merge...
Auto-merging operators/multiclusterobservability/pkg/rendering/renderer_alertmanager_test.go
Auto-merging operators/multiclusterobservability/pkg/rendering/renderer_alertmanager.go
CONFLICT (content): Merge conflict in operators/multiclusterobservability/pkg/rendering/renderer_alertmanager.go
Auto-merging operators/multiclusterobservability/manifests/base/alertmanager/alertmanager-statefulset.yaml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 remove HA mode when AM has one replica

In response to this:

/cherrypick release-2.11

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.