Set batched migrations autovacuum to true by default

Irina Bronipolskyrequested to merge
irinabron/512966-2-enable-autovacuum-default into master

What does this MR do and why?

  • Enable the Gitlab::Database::HealthStatus::Indicators::AutovacuumActiveOnTable by default in order to throttle background migration that actively update table
  • Update docs

References

#512966 (closed)

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