Add activity feed API

[zzj3720]

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[zzj3720]

• Add activity feed API #9619 👈 (View in Graphite)
• canary

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.82%. Comparing base (126d576) to head (dfa1c2a).
Report is 193 commits behind head on canary.

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #9619      +/-   ##
==========================================
+ Coverage   51.63%   52.82%   +1.18%     
==========================================
  Files        2155     2180      +25     
  Lines       97552    98426     +874     
  Branches    16345    16690     +345     
==========================================
+ Hits        50371    51993    +1622     
+ Misses      45789    44990     -799     
- Partials     1392     1443      +51     

Flag	Coverage Δ
server-test	77.83% <ø> (-1.01%)	⬇️
unittest	32.30% <ø> (+1.25%)	⬆️

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