feat(server): record pending updates count to metrics

[fengmk2]

close CLOUD-161

[fengmk2]

• #10991 👈 (View in Graphite)
• canary

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.29%. Comparing base (c98f090) to head (89a0880). Report is 1 commits behind head on canary.

Additional details and impacted files

@@            Coverage Diff             @@
##           canary   #10991      +/-   ##
==========================================
+ Coverage   54.28%   54.29%   +0.01%     
==========================================
  Files        2478     2478              
  Lines      114239   114259      +20     
  Branches    18742    18742              
==========================================
+ Hits        62015    62040      +25     
+ Misses      50904    50899       -5     
  Partials     1320     1320              

Flag	Coverage Δ
server-test	78.95% <100.00%> (+0.01%)	:arrow_up:
unittest	30.73% <ø> (ø)

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[graphite-app[bot]]

Merge activity

• Mar 19, 5:12 AM EDT: A user added this pull request to the Graphite merge queue.
• Mar 19, 9:39 AM UTC: The Graphite merge queue couldn't merge this PR because it was not satisfying all requirements (Failed CI: '3, 2, 1 Launch', 'E2E Test (1)').
• Mar 19, 9:18 AM EDT: A user added this pull request to the Graphite merge queue.
• Mar 19, 11:29 AM EDT: A user merged this pull request with the Graphite merge queue.