Increased the heartbeat interval to avoid unnecessary network traffic.
Increased the heartbeat interval to avoid unnecessary network traffic.

seanly/jenkins-build-monitor-plugin,DominikGebhart/jenkins-build-monitor-plugin,jan-molak/jenkins-build-monitor-plugin,jan-molak/jenkins-build-monitor-plugin,erikhakansson/jenkins-build-monitor-plugin,erikhakansson/jenkins-build-monitor-plugin,seanly/jenkins-build-monitor-plugin,jan-molak/jenkins-build-monitor-plugin,DominikGebhart/jenkins-build-monitor-plugin,erikhakansson/jenkins-build-monitor-plugin,DominikGebhart/jenkins-build-monitor-plugin,erikhakansson/jenkins-build-monitor-plugin,seanly/jenkins-build-monitor-plugin,jan-molak/jenkins-build-monitor-plugin