Collectors not showing individually on investigator

Products

• CA Application Performance Management Agent (APM / Wily / Introscope)
• CA Application Performance Management (APM / Wily / Introscope)
• INTROSCOPE
• DX Application Performance Management

Issue/Introduction

The Enterprise Manager cluster consists of a MOM and two collectors. Both collectors are accepting agent connections and those agents are reporting on the investigator. However all agents are showing the same name for the EM Host metric and only that name appears as a Custom Metric Agent (Virtual) branch.. e.g.there is only one branch like the following

Custom Metric Host (virtual)|Custom Metric Process (virtual)|Custom Metric Agent (virtual)([email protected])(SuperDomain)

Environment

Release : 10.5

Component : Introscope

Cause

The name used for the collector in this situation was being picked up from the /etc/hosts file on each system.

In each case the first alias for the ip address that was being used was set to the same value e.g. 

on host1 the hosts file had an entry

10.192.168.7 samename host1 host1.mydomain.com


on host2 the hosts file had an entry

10.192.168.9 samename host2 host2.mydomain.com


and the logfile showed the following entries

2/01/20 07:07:26.288 AM GMT [INFO] [main] [Manager.Cluster] Setting the Enterprise Manager Collector identifier to ([email protected])

2/01/20 07:10:26.799 AM GMT [INFO] [main] [Manager] Fully-qualified domain name is samename

Resolution

The behaviour does not appear to be 100% consistent across environments and in some situations the use of the first alias only occurs when specific IP binding is specified in the IntroscopeEnterpriseManager.properties file using the property

introscope.enterprisemanager.ipaddress

The solution is to ensure hosts have unique aliases in the /etc/hosts file