added additional timers for peers bootstrapper to track individual steps.

* master: (26 commits)
  [dbnode][m3ninx] Rename doc.Document -> doc.Metadata (#3062)
  Don't attempt to lint genny gen'd code (#3063)
  [coordinator] Add ability to turn off rule matching cache (#3059)
  [r2ctl] Bump urijs from 1.19.1 to 1.19.5 in /src/ctl/ui (#3055)
  [aggregator/client] Metric for dropped metrics (#3054)
  [query] Add Graphite support for ** with metric path selectors (#3020)
  [tools] Fix failing linter (#3052)
  [query] implemented Graphite's `powSeries` function (#3038)
  [coordinator] Add Graphite Carbon rewrite cleanup integration test (#3049)
  [coordinator] Add Graphite rewrite cleanup directive for cleansing incoming metrics (#3047)
  [coordinator] Add Graphite Carbon ingest contains rule matcher for fast match (#3046)
  [query] Update Graphite quoted strings to just escape quotes and a flag for previous escape behavior (#3022)
  [query] Graphite match regexp all values for __g0__ tag matcher instead of match field (#3021)
  [coordinator] Add Carbon ingest latency metrics (#3045)
  [aggregator] Fix panic on invalid unaggregated payloads (#3041)
  [coordinator] Ignore rollup rule storage policies when deciding to utilize auto-mapping rules (#3044)
  [dbnode] Support checkpointing in cold flusher and preparing index writer per block (#3040)
  [dbnode] Client borrow connection API (#3019)
  [DOCS] Add back FAQ and troubleshooting sections (#3029)
  [DOCS] SEO and config changes (#3024)
  ...

…ter encapsulation and easier usage.

* master:
  [x] Replace InnerError() method usages with xerrors.InnerError() (#3068)
  [dbnode] Remove per-series traces on read queries (#3074)
  [coordinator] Remove includeRollupsOnDefaultRuleFiltering flag (#3073)
  [coordinator] Add TagFilter Matches comments (#3072)
  [query] Fix aggregated namespace header to be bad request instead of internal server error (#3070)
  [dbnode][m3ninx] Add support for reading document containers from an index (#3050)
  [dtest] Add a method for Prom remote writes (#3065)
  [dbnode] Add ExcludeOrigin to skip localhost on BorrowConnections (#3066)
  [dtest] Upgrade dockertest to v3.6.3 (#3053)

* master:
  [dtest] Run tests on an existing cluster launched with docker compose (#3067)
  [coordinator] Disable downsampler matcher cache by default (#3080)
  [dbnode][m3ninx] Use new doc.Document in query results to reduce slice allocations (#3057)
  [matcher/coordinator] Add latency metrics to rule matching (#3083)
  [coordinator] Rollout augmentM3Tags flag to true by default (#3082)
  [aggregator] Add ActivePlacementVersion to tcp client (#3071)