Observability Edot Java Migrate

If you're moving a Java app from Elastic's classic APM agent to their newer EDOT (Elastic Distribution of OpenTelemetry) agent, this walks you through the switch. It handles the mechanical stuff: swapping out elastic-apm-agent.jar for elastic-otel-javaagent.jar, translating environment variables from the ELASTIC_APM_* format to OTEL_* equivalents, and making sure you point at the right OTLP endpoint instead of the old APM Server URL. The main gotcha it avoids is running both agents simultaneously, which will cause problems. It's built by Elastic and covers the javaagent attachment methods and the three required config variables you absolutely need to set.