Aborted Connection Spike
warningHigh rate of aborted connections indicates network issues, client timeouts, or application connection handling problems. Aborted connections waste resources and can indicate larger infrastructure or application issues.
mysql.net.aborted_clients rate > 10/sec or mysql.net.aborted_connects rate > 10/sec sustained for >5 minutes, with mysql.net.connections rate also elevated
Distinguish between aborted_clients (connections closed improperly by client) and aborted_connects (failed connection attempts). For aborted_clients: check application connection handling, network stability, and wait_timeout/interactive_timeout settings. For aborted_connects: review authentication failures, max_connections limits, DNS resolution issues. Query performance_schema.host_cache for connection errors by host. Check MySQL error log for connection-related messages. Monitor connect_timeout - if too low, legitimate slow clients may be rejected.