fix for metric context import

[umustafi]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• [ ] My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-XXX

Description

• [ ] Here are some details about my PR, including screenshots (if applicable):

Tests

• [ ] My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• [ ] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-commenter]

Codecov Report

Merging #3453 (509b5c7) into master (44a7e1a) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #3453      +/-   ##
============================================
- Coverage     46.60%   46.60%   -0.01%     
- Complexity    10339    10340       +1     
============================================
  Files          2074     2074              
  Lines         80958    80958              
  Branches       9031     9031              
============================================
- Hits          37733    37731       -2     
- Misses        39749    39754       +5     
+ Partials       3476     3473       -3     

Impacted Files	Coverage Δ
...java/org/apache/gobblin/metrics/MetricContext.java	79.38% <100.00%> (ø)
.../org/apache/gobblin/metrics/RootMetricContext.java	73.43% <100.00%> (-6.25%)	:arrow_down:
...in/java/org/apache/gobblin/cluster/HelixUtils.java	28.26% <0.00%> (-5.08%)	:arrow_down:
...a/org/apache/gobblin/cluster/GobblinHelixTask.java	62.36% <0.00%> (+2.15%)	:arrow_up:
...lin/restli/throttling/ZookeeperLeaderElection.java	72.22% <0.00%> (+2.22%)	:arrow_up:
...t/version/TimestampedDatasetStateStoreVersion.java	33.33% <0.00%> (+5.55%)	:arrow_up:
.../java/org/apache/gobblin/cluster/SleepingTask.java	45.45% <0.00%> (+6.06%)	:arrow_up:
...lin/util/filesystem/FileSystemInstrumentation.java	100.00% <0.00%> (+7.14%)	:arrow_up:
...a/org/apache/gobblin/util/limiter/NoopLimiter.java	60.00% <0.00%> (+20.00%)	:arrow_up:

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