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Status Functionality already exists
Workspace Instana
Categories Tracing
Created by Guest
Created on Jul 19, 2022

Enable custom Instana SDK instrumentation on an individual pod

Adding custom spans to Java applications using the Instana SDK requires configuration on the agent.


https://www.ibm.com/docs/en/instana-observability/current?topic=references-configuration-based-java-trace-sdk#example


When the Instana agent is deployed as a DaemonSet in an OpenShift cluster, this configuration is centralized and is then applied to all Java applications running within the OpenShift cluster. Thus, the hot attach of the Instana javaagent requires a full search of all the packages listed in the centralized configuration file and causes the JVM to pause for an extended period of time as more packages are added to the centralized configuration. This slows pods from reaching a readiness state, has the potential to cause liveness probes to fail, and stops event-consuming applications from processing events. Ultimately, including packages in the centralized configuration is not sustainable in a production environment because of the adverse effects across all the Java applications in the cluster.


This configuration needs to be delegated to the individual pods so the entire cluster isn't impacted. The configuration parameter com.instana.plugin.javatrace should be configurable on the application pod and not just via the centralized configuration, possibly using the files functionality:


https://www.ibm.com/docs/en/instana-observability/current?topic=agent-host-configuration#configurations-from-process-environment-and-files


In addition, delegation of the configuration to pods/processes should be available for all of the stanzas, including JMX as well.

Idea priority High