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  1. Red Hat Advanced Cluster Management
  2. ACM-16211

ACM 2.12 - Alertmanager is stuck in HA mode even if there is only one replica

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    • Observability Sprint 32, Observability Sprint 33, Observability Sprint 34, Observability Sprint 35
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      Description of problem:

      As per https://prometheus.io/docs/alerting/latest/alertmanager/#high-availability, when configuring Alertmanager HA, the Prometheus should send requests to all alertmanagers.

       

      RHACM run 3 alertmanagers in clustered mode in the Hub cluster. However we send alerts over a single Route from the managed clusters configuration which means we might run into the problems described in https://groups.google.com/g/prometheus-users/c/ul3tFfPxkC0 

       

      Discussed in https://redhat-internal.slack.com/archives/CUU609ZQC/p1723548761663429

      Version-Release number of selected component (if applicable):

      How reproducible:

      Steps to Reproduce:

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      Actual results:

      Expected results:

      Additional info:

        1. DEV-acm-observability-alertmanager-messages-queued.PNG
          DEV-acm-observability-alertmanager-messages-queued.PNG
          23 kB
        2. PROD-acm-observability-alertmanager-messages-queued.PNG
          PROD-acm-observability-alertmanager-messages-queued.PNG
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            [ACM-16211] ACM 2.12 - Alertmanager is stuck in HA mode even if there is only one replica

            Errata Tool added a comment -

            Since the problem described in this issue should be resolved in a recent advisory, it has been closed.

            For information on the advisory (Important: Red Hat Advanced Cluster Management 2.12.2 security and bug fix updates), and where to find the updated files, follow the link below.

            If the solution does not work for you, open a new bug report.
            https://access.redhat.com/errata/RHSA-2025:0851

            Errata Tool added a comment - Since the problem described in this issue should be resolved in a recent advisory, it has been closed. For information on the advisory (Important: Red Hat Advanced Cluster Management 2.12.2 security and bug fix updates), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2025:0851

            Coleen Iona Quadros added a comment -

            https://github.com/stolostron/multicluster-observability-operator/pull/1701

            Coleen Iona Quadros added a comment - https://github.com/stolostron/multicluster-observability-operator/pull/1701

              rh-ee-coquadro Coleen Iona Quadros
              pgough@redhat.com Philip Gough
              Xiang Yin Xiang Yin
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                Created:
                Updated:
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