Lack of connection count monitoring delays detection of connection exhaustion

Without alerting on HAProxy frontend session counts approaching maxconn limit, operators only discover connection exhaustion when load balancers start failing health checks and dropping from rotation, by which point cascading failures may already be occurring.

Configure monitoring and alerting for active HAProxy frontend sessions with thresholds well below the maxconn value (e.g., 70-80% of maxconn). This provides early warning before connection exhaustion causes service degradation or outage.