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This change exposes more metrics from the embedded Alertmanager, which are valuable for troubleshooting Alertmanager operation particularly in HA setups. ``` grafana_alerting_notifications_total grafana_alerting_notifications_failed_total grafana_alerting_notification_requests_total grafana_alerting_notification_requests_failed_total grafana_alerting_notification_latency_seconds grafana_alerting_nflog_gc_duration_seconds grafana_alerting_nflog_snapshot_duration_seconds grafana_alerting_nflog_snapshot_size_bytes grafana_alerting_nflog_queries_total grafana_alerting_nflog_query_errors_total grafana_alerting_nflog_query_duration_seconds grafana_alerting_nflog_gossip_messages_propagated_total grafana_alerting_dispatcher_aggregation_groups grafana_alerting_dispatcher_alert_processing_duration_seconds ``` Note that `alertmanager_dispatcher_aggregation_group_limit_reached_total` is explicitly not exposed, as the group limit metrics are not enabled.
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