GarbageCollectionMonitorTest.groovy

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Introduce test that simulates GC activity

  1. … 6 more files in changeset.
Rework daemon GC/memory expiration checks

- Do not sniff for VM vendor to figure out which GC strategies may be used

- Rename permgen -> non-heap in most places, Java 8+ uses metaspace for this memory pool

- Rename tenured -> heap

- Only add GarbageCollectionEvents to the observation window when there's been a GC collection

- This simplifies the calculation of GC rate

- Non-heap memory pools are not GC'd

- Re-enable daemon performance soak test

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    ./GarbageCollectionMonitorTest.groovy
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Added tests to guard against future NPEs caused by trying to collect stats from unsupported GCs

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    ./GarbageCollectionMonitorTest.groovy
Adding support for monitoring perm gen usage

+review REVIEW-5973

  1. … 8 more files in changeset.
Improving test coverage for low heap detection

+review REVIEW-5946

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    ./GarbageCollectionMonitorTest.groovy
  1. … 6 more files in changeset.