Prometheus Metrics

[abhinavsingh]

1. Start proxy.py with --enable-metrics flag
2. Metrics are available at http://localhost:8899/metrics
3. Use --metrics-path to override endpoint where metrics are exposed, defaults to /metrics
4. Exposed metrics

# HELP proxypy_work_started_total Total work accepted and started by proxy.py core
# TYPE proxypy_work_started_total counter
proxypy_work_started_total 4.0

# HELP proxypy_work_request_received_total Total work finished sending initial request
# TYPE proxypy_work_request_received_total counter
proxypy_work_request_received_total 2.0

# HELP proxypy_work_finished_total Total work finished by proxy.py core
# TYPE proxypy_work_finished_total counter
proxypy_work_finished_total 2.0

# HELP proxypy_work_active Total work under active execution
# TYPE proxypy_work_active gauge
proxypy_work_active 2.0

• Fixes Support Prometheus via plugin #1320
• Closes [WIP] Starting with metrics and prometheus  #1414
• Fixes [Core] Near realtime resource / stats monitoring #1023

[codecov]

Codecov Report

Attention: Patch coverage is 49.36709% with 80 lines in your changes missing coverage. Please review.

Project coverage is 83.97%. Comparing base (71f3c65) to head (4e0bcfe).
Report is 18 commits behind head on develop.

Files with missing lines	Patch %	Lines
proxy/core/event/metrics.py	48.64%	36 Missing and 2 partials ⚠️
proxy/http/server/metrics.py	35.29%	33 Missing ⚠️
proxy/common/flag.py	14.28%	4 Missing and 2 partials ⚠️
proxy/http/server/web.py	75.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1447      +/-   ##
===========================================
- Coverage    84.60%   83.97%   -0.63%     
===========================================
  Files          178      180       +2     
  Lines         8133     8288     +155     
  Branches      1241     1266      +25     
===========================================
+ Hits          6881     6960      +79     
- Misses        1053     1127      +74     
- Partials       199      201       +2     

Flag	Coverage Δ
GHA	83.81% <49.36%> (-0.63%)	⬇️
Linux	83.45% <49.36%> (-0.62%)	⬇️
Python 3.10	84.48% <49.36%> (-0.70%)	⬇️
Python 3.11	83.72% <49.36%> (-0.63%)	⬇️
Python 3.12	83.72% <49.36%> (-0.63%)	⬇️
Python 3.6	84.42% <49.36%> (-0.70%)	⬇️
Python 3.7	84.42% <49.36%> (-0.70%)	⬇️
Python 3.8	84.49% <49.36%> (-0.70%)	⬇️
Python 3.9	84.55% <49.36%> (-0.70%)	⬇️
Windows	77.71% <49.36%> (-0.45%)	⬇️
macOS	83.81% <49.36%> (-0.63%)	⬇️
pytest	83.81% <49.36%> (-0.63%)	⬇️

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