Metrics sampling

[mohabusama]

• Sampling can be used by ZMON backend to throttle certain account metrics ingestion
• Method used: random non-uniform sampling

Resolve #380

[codecov]

Codecov Report

Merging #382 into master will decrease coverage by 0.05%.
The diff coverage is 72%.

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
- Coverage   75.33%   75.28%   -0.06%     
==========================================
  Files          80       80              
  Lines        5819     5887      +68     
==========================================
+ Hits         4384     4432      +48     
- Misses       1435     1455      +20

Impacted Files	Coverage Δ
zmon_worker_monitor/zmon_worker/tasks/main.py	75.55% <100%> (+0.82%)	⬆️
zmon_worker_monitor/tasks.py	75% <50%> (ø)	⬆️
zmon_worker_monitor/workflow.py	67.87% <51.21%> (-3.38%)	⬇️

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[vetinari]

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[mohabusama]

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