PMM-9634 Timestamp bucket_start_time for newer versions.

[JiriCtvrtka]

PMM-9634

Original PR: percona/pmm-agent#329

Build: Percona-Lab/pmm-submodules#2376

• Links to other linked pull requests (optional).

[codecov]

Codecov Report

Merging #913 (872ad22) into main (0c3b4da) will increase coverage by 0.00%.
The diff coverage is 42.85%.

@@           Coverage Diff           @@
##             main     #913   +/-   ##
=======================================
  Coverage   44.04%   44.05%           
=======================================
  Files         334      334           
  Lines       39790    39796    +6     
=======================================
+ Hits        17527    17532    +5     
- Misses      20737    20739    +2     
+ Partials     1526     1525    -1     

Flag	Coverage Δ
agent	53.88% <42.85%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...gents/postgres/pgstatmonitor/stat_monitor_cache.go	46.11% <40.00%> (+0.30%)	⬆️
...nts/postgres/pgstatmonitor/pgstatmonitor_models.go	56.98% <44.44%> (+6.71%)	⬆️
agent/agents/mysql/slowlog/slowlog.go	48.29% <0.00%> (-2.98%)	⬇️
...ent/agents/postgres/pgstatmonitor/pgstatmonitor.go	13.93% <0.00%> (+0.73%)	⬆️

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