public void setAlertThreshold(int alertThreshold) {
    this.alertThreshold = alertThreshold;
  }
Set AlertThreshold for this GatewaySender.

Care must be taken to set this consistently across all gateway senders in the cluster and only
when safe to do so.

@since Geode 1.15
geode-core/src/main/java/org/apache/geode/internal/cache/wan/AbstractGatewaySender.java