Agent Metric Clamp

Products

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

Issue/Introduction

MQ Application has  300+ queues but in APM they are able to see only 200+ queues due to metric clamp. 

Environment

Release : 10.7

Component : APM Agent 

Cause

Root Cause: Agent metric clamp - Agent metrics exceed the limit.

Agent Log:
 [DEBUG] [PO:WatchedAgentPO Mailman 6] [Manager.Agent] Agent  BroadcomTest reported 500,062 metrics

From EM : apm-events-thresholds-config.xml

apm-events-thresholds-config.xml 

<clamp id="introscope.enterprisemanager.agent.metrics.limit">
            <description>
                Most properties here put limits on # of metrics.
                The last limits metric data. The metric clamping properties support hot config.
                Per Agent limit. Takes into account live and historical metrics.
            </description>
            <threshold value="500000"/>

Resolution

1. Use JMX Filters :
introscope.agent.jmx.name.filter=
introscope.agent.jmx.ignore.attributes=

2. Increase the value to fit your environment and resources. When the limit is increased, the agent may generates and sends more data. It may overload EM.  
introscope.enterprisemanager.agent.metrics.limit=