bug: Restore periodicreporter after complex merge dropped it.

[jrconlin]

Closes #1119

[codecov-io]

Codecov Report

Merging #1120 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1120      +/-   ##
==========================================
+ Coverage   99.71%   99.71%   +<.01%     
==========================================
  Files          60       60              
  Lines        9909     9923      +14     
==========================================
+ Hits         9881     9895      +14     
  Misses         28       28

Impacted Files	Coverage Δ
autopush/metrics.py	100% <100%> (ø)	⬆️
autopush/tests/test_metrics.py	100% <100%> (ø)	⬆️
autopush/main.py	87.13% <100%> (+0.22%)	⬆️

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