Agent metadata proto

[pingsutw]

Tracking issue

#3936

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.38%. Comparing base (7d712de) to head (5f35e8c).
Report is 945 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4500      +/-   ##
==========================================
- Coverage   59.76%   59.38%   -0.38%     
==========================================
  Files         636      638       +2     
  Lines       53870    53957      +87     
==========================================
- Hits        32193    32044     -149     
- Misses      19146    19383     +237     
+ Partials     2531     2530       -1     

Flag	Coverage Δ
unittests	59.38% <ø> (-0.38%)	⬇️

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[EngHabu]

I would make the value a message:

message Secret {
  string value = 1;
  // In the future:
  // string encrypted_value = 2;
  // string mount_path = 3;
}