adds Start() method to WAL interface to delay checkpointing until aft…

[owen-d]

…er replay

[codecov-io]

Codecov Report

Merging #3339 (7a614fc) into master (76e713f) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3339      +/-   ##
==========================================
- Coverage   62.72%   62.71%   -0.01%     
==========================================
  Files         205      205              
  Lines       17310    17312       +2     
==========================================
  Hits        10857    10857              
- Misses       5478     5480       +2     
  Partials      975      975              

Impacted Files	Coverage Δ
pkg/ingester/wal.go	80.45% <50.00%> (-0.94%)	⬇️
pkg/ingester/ingester.go	49.39% <100.00%> (+0.15%)	⬆️
pkg/ingester/checkpoint.go	72.62% <0.00%> (-1.15%)	⬇️
pkg/logql/evaluator.go	90.19% <0.00%> (+0.35%)	⬆️

[slim-bean]

LGTM