* Revert part of "AcctIdx: cleanup bg threads (#20731)" This reverts part of commit 47de4f31b663abfb237b29ab66ab7a80b406d746. * change bg waiting metrics to percent
* Revert part of "AcctIdx: cleanup bg threads (#20731)" This reverts part of commit 47de4f31b663abfb237b29ab66ab7a80b406d746. * change bg waiting metrics to percent