Merge pull request ceph#62537 from zdover23/wip-doc-2025-03-27-mon_warn_pg_not_scrubbed_ratio-guidance

src/common: add guidance for mon_warn_pg_not_scrubbed

Reviewed-by: Anthony D'Atri <[email protected]>

Author: zdover23

src/common/options/global.yaml.in

@@ -1810,7 +1810,7 @@ options:
 - name: mon_warn_pg_not_scrubbed_ratio
   type: float
   level: advanced
-  desc: Percentage of the scrub max interval past the scrub max interval to warn
+  desc: Raise a health warning when shallow scrubs are delayed by this percentage of the shallow scrub interval. Note that this must be set at mgr or with global scope. Set this configurable with the command "ceph config set mgr mon_warn_pg_not_scrubbed_ratio <ratio_value>".
   default: 0.5
   see_also:
   - osd_scrub_max_interval