fix: Singlenton removed from PrometheusMonitor

[marcosschroh]

No description provided.

[codecov]

Codecov Report

Merging #105 (6b6fcaa) into master (0212c86) will increase coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   95.56%   95.97%   +0.40%     
==========================================
  Files          21       20       -1     
  Lines         677      670       -7     
==========================================
- Hits          647      643       -4     
+ Misses         30       27       -3     

Flag	Coverage Δ
unittests	95.97% <100.00%> (+0.40%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
kstreams/test_utils/test_utils.py	97.82% <ø> (-0.05%)	⬇️
kstreams/engine.py	97.95% <100.00%> (ø)
kstreams/prometheus/monitor.py	100.00% <100.00%> (+4.54%)	⬆️
kstreams/rebalance_listener.py	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[Damephena]

LGTM