Symptoms:

• SNMP traps are frequently and irregularly generated when using the vCenter Server 6.0.
• The Task and Events in vCenter Server display:
  
  Alarm 'Health status changed alarm' on Datacenters triggered by event xxxxx 'vmware-vpostgres status changed from gray to green
  
  
• There is an alarm triggered with this description:
  
  vmware-vpostgres status changed from green to gray
  
  
• The traps look similar to:
  
  SNMPv2-SMI::enterprises.xxxx.x.x.xxx.x = STRING: "alarm.HealthStatusChangedAlarm - Event: Status change (xxxxx)
  Summary: vmware-vpostgres status changed from green to gray
  Date: MM/DD/YY xx:xx:xx
  Arguments:
  componentId = vmware-vpostgres
  componentName = vmware-vpostgres
  
• In the /var/log/vmware/sca/sca.log file, or C:\ProgramData\VMware\vCenterServer\logs\sca\sca.log file, you see entries similar to:
  
  <YYYY-MM-DD>T<time> [pool-x-thread-xx WARN com.vmware.sca.health.HealthStatusRequest] readHealthStatusFromFile: File has expired data; service:'vmware-vpostgres', file:/etc/vmware-sca/health/vmware-postgres-health-status.xml, expired:<YYYY-MM-DD>T<time>, now:<YYYY-MM-DD>T<time>
  
  
  </time></time></time>Notes:
  • This issue occurs in both the VMware vCenter Server Appliance and VMware vCenter Server installed on Windows.
  • The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.