Programmatic self-attach configuration

Kibana version:
Elasticsearch version:
APM Server version:
APM Agent language and version:


I have a few grails@2.2.4 applications, a few grails@3.3.1 applications, and a couple of pure springBoot@1.5.6 applications. I'm trying to setup elastic as a platform for both APM and metric collection/monitoring for all of them.
I initially tested Elastic APM with the javaagent loaded via VMOptions, and was successful in it. I then tested the programmatic API to self-attach the agent in runtime, and was also successful with it[1].

Issue [1]: For grails@2.2.4, there's no equivalent of src/main/resources/ that I could find (I didn't debug the agent to see where it was looking for, maybe I'm wrong). Thus, I reverted back to using VMOptions for configuration while still loading the agent via the programmatic API in runtime. Even though configuration wasn't ideal, it worked fine.

Now, I went through the thin API of ElasticApmAttacher and there doesn't seem to be a way to do a local attach (not a remote one) and provide configuration during the call to ElasticApmAttacher.attach(). It'd be incredibly easier and more powerfull in terms of customization and proper environment/service/version detection (none of the other configuration methods come close) if we could, for example:

	service_name: "bacon-service",
	service_version: ReadFromSomewhereElse.getVersion(),
	environment: GrailsSomething.getCurrentEnvironment(),
	transaction_sample_rate: Redis.getIt(),
	log_level: "WARN",
	server_urls: ReadFromConsul.forExample()

I suppose I could hack into the ElasticApmAttacher#attach(java.lang.String, java.lang.String) method and try to attach to the current VM as if it were a remote one (so that I could pass the agentArgs along), but that doesn't seem idiomatic or proper.

Is there already a way to achieve this? Am I missing something? Would this be interesting in general?
Also, one last question, why exactly is the programmatic API to self-attach marked as experimental? Are there any limitations? It seems to work perfectly on java7 zulu for me.

I like the idea of being able to provide a map for self attachment. Will implement that shortly.

I have documented some caveats of the runtime attachment here:

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