[#noissue] Fix visibility of node histogram during concurrent execution

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.42857% with 18 lines in your changes missing coverage. Please review.

Project coverage is 36.89%. Comparing base (bf65e65) to head (d49c971). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...pender/histogram/DefaultNodeHistogramAppender.java	70.27%	10 Missing and 1 partial :warning:
...plicationmap/util/CancellableHistogramFactory.java	53.84%	5 Missing and 1 partial :warning:
...npoint/web/applicationmap/util/TimeoutWatcher.java	92.30%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #11736 +/- ## ============================================ - Coverage 36.89% 36.89% -0.01% - Complexity 12396 12405 +9 ============================================ Files 4104 4106 +2 Lines 100690 100713 +23 Branches 10556 10552 -4 ============================================ + Hits 37153 37161 +8 - Misses 60535 60547 +12 - Partials 3002 3005 +3 ```

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