[7.14] [task manager] provide better diagnostics when task manager performance is degraded (#109741)#110875

Merged

pmuellr merged 2 commits intoelastic:7.14from pmuellr:backport/7.14/pr-109741

Sep 1, 2021

+192-83

Commits on Sep 1, 2021

[task manager] provide better diagnostics when task manager performance is degraded (elastic#109741 )
pmuellr
committed
fix backport to remove post-7.14 stuff
pmuellr
committed