> This is the implementation for JEP 451. There are two parts to this:
> 
> 1. A multi-line warning is printed when a JVM TI or Java agent is loaded into 
> a running VM. For JVM TI, the message is printed to stderr from 
> JvmtiAgent::load. For Java agents, it is printed to System.err (as that may 
> be redirected) in the JPLIS (j.l.instrumentation) implementation. This part 
> includes an update to the JVM TI spec and API docs to require the warning.
> 
> 2. If running with -Djdk.instrument.traceUsage or 
> -Djdk.instrument.traceUsage=true, the calls to the Instrumentation API print 
> a trace message and stack trace.
> 
> Testing: tier1-6

Alan Bateman has updated the pull request with a new target base due to a merge 
or a rebase. The incremental webrev excludes the unrelated changes brought in 
by the merge/rebase. The pull request contains 17 additional commits since the 
last revision:

 - Add impl note to document the XX option
 - Cleanup
 - Merge
 - Allow for warning to be skipped when same agent loaded a second/subsequent 
time
 - Merge
 - Tweak javadoc, update test to use more test infra
 - Merge
 - Merge
 - Refresh package description
 - Merge
 - ... and 7 more: https://git.openjdk.org/jdk/compare/945d3951...2d9d5922

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13899/files
  - new: https://git.openjdk.org/jdk/pull/13899/files/a6d3c23c..2d9d5922

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13899&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13899&range=05-06

  Stats: 5984 lines in 158 files changed: 4481 ins; 816 del; 687 mod
  Patch: https://git.openjdk.org/jdk/pull/13899.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13899/head:pull/13899

PR: https://git.openjdk.org/jdk/pull/13899

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