PostgreSQLMaxConnectionsReached
{{ $labels.instance }} is exceeding the currently configured maximum Postgres connection limit (current value: {{ $value }}s). Services may be degraded - please take immediate action (you probably need to increase max_connections in the Docker image and re-deploy.
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The rule sums the current open PostgreSQL sessions (pg_stat_activity_count) for each instance and checks whether this total is greater than or equal to the usable connection capacity, calculated as the configured max_connections minus the reserved superuser connections (pg_settings_superuser_reserved_connections). The alert triggers when an instance’s active connections reach or exceed this usable limit, indicating the instance is at or over its maximum allowed connections.
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