feat(graceful-shutdown): allow replacing the preStop hook from the CR

[Anton0C]

spec.gracefulShutdown.preStop is a full corev1.LifecycleHandler. When set it replaces the built-in PROXYSQL PAUSE drain command wholesale; when unset the operator keeps the existing hook. MYSQL_PWD is still injected from the admin Secret so a custom exec can talk to admin :6032.

Without a delay, kube-proxy can still DNAT new connections after PAUSE:

client -> Service -> terminating pod (listener already paused)

With a custom preStop, wait first, then pause:

t=0  sleep N  (pod still accepts; endpoints drain)
t=N  PROXYSQL PAUSE

Example:

  gracefulShutdown:
    enabled: true
    drainTimeoutSeconds: 600
    preStop:
      exec:
        command:
          - /bin/sh
          - -c - sleep 5; mysql --no-defaults --connect-timeout=2 -h127.0.0.1 -P6032 -uadmin -e 'PROXYSQL PAUSE' 2>/dev/null || true; for i in $(seq 1 600); do c=$(mysql --no-defaults --connect-timeout=2 -N -h127.0.0.1 -P6032 -uadmin -e "SELECT Variable_Value FROM stats_mysql_global WHERE Variable_Name='Client_Connections_connected'" 2>/dev/null); [ "${c:-0}" -le 0 ] && break; sleep 1; done 

[coderabbitai]

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