LOG4J2-3116 Google Cloud structured logging via JsonTemplate

[rocketraman]

No description provided.

[vy]

@rocketraman, I have pushed my changes to #551. I had already started working on the ticket before you had submitted your PR, hence I wanted to stick to that. Nevertheless, credit still goes to you in changes.xml. #551 has the following differences:

• exception_class, exception_message, and exception_stacktrace are respectively renamed to class, message, and stackTrace.
• Uses CounterResolver for logging.googleapis.com/insertId.
• Contains more versatile tests.

I am happy with the final state of #551. If you approve, please go ahead and squash+rebase it onto release-2.x. I would also appreciate it if you can cherry-pick it onto master, otherwise I can deal with it myself too.

[rocketraman]

@rocketraman, I have pushed my changes to #551. I had already started working on the ticket before you had submitted your PR, hence I wanted to stick to that. #551 has the following differences:

I'm a little confused as to why you would have started work on the PR when you specifically asked me to do so on the dev mailing list when I proposed this modification, and I did that less than 3 hours later: https://lists.apache.org/thread.html/rdc25435870e47284564575b53d3b0dbf69e33ae7736f388878b89bf0%40%3Cdev.logging.apache.org%3E.

Nevertheless, credit still goes to you in changes.xml

I do appreciate that, though it would have been nice to get the "commit credit" as well. Nevertheless, not a big deal.

#551 has the following differences:

I'll take a look shortly.

[vy]

@rocketraman, sorry for the mess. I very well see your point for commit credit. I will base #551 on top of #543.

[rocketraman]

@rocketraman, sorry for the mess. I very well see your point for commit credit. I will base #551 on top of #543.

I appreciate that @vy. I see you've merged this in already, awesome!