SLING-5965 : added metrics for number of, oldest and timers for scheduler jobs, ability to group by thread pool or custom configurable filter, plus used all of this to build a HealthCheck out of it which complains if there is a scheduler job running for more than 60 seconds

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1802777 13f79535-47bb-0310-9956-ffa450edef68
9 files changed
tree: 70ef57d3dbae424ae991c3826bc893a97c0709ec
  1. src/
  2. pom.xml
  3. README.txt