support health check for liveness and readiness

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Base: 70.70% // Head: 70.60% // Decreases project coverage by -0.10% ⚠️

Coverage data is based on head (f6c4446) compared to base (d405ee3).
Patch coverage: 86.30% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #594      +/-   ##
==========================================
- Coverage   70.70%   70.60%   -0.11%     
==========================================
  Files          63       63              
  Lines       12331    12404      +73     
==========================================
+ Hits         8719     8758      +39     
- Misses       2792     2818      +26     
- Partials      820      828       +8     

Impacted Files	Coverage Δ
base/parallel/condition_channel.go	85.71% <ø> (ø)
storage/cache/database.go	70.76% <ø> (ø)
storage/data/database.go	69.53% <ø> (ø)
worker/worker.go	66.47% <72.22%> (-0.36%)	⬇️
server/rest.go	76.31% <87.17%> (+0.31%)	⬆️
storage/cache/mongodb.go	76.71% <100.00%> (-2.90%)	⬇️
storage/cache/no_database.go	100.00% <100.00%> (ø)
storage/cache/redis.go	75.29% <100.00%> (-0.61%)	⬇️
storage/cache/sql.go	79.73% <100.00%> (+0.18%)	⬆️
storage/data/mongodb.go	81.45% <100.00%> (-1.55%)	⬇️
... and 8 more

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