Open thread counts keyed by contribution key (AnchorType === 'Contribution').
Open thread counts keyed by normalized (lowercase) field name (AnchorType === 'Field').
Open thread counts keyed by left-nav rail group key (AnchorType === 'Group' PLUS
any open section/field threads whose AnchorMetadataObject.groupKey belongs to that group).
Open thread counts keyed by section key (AnchorType === 'Section' PLUS any open
field threads whose AnchorMetadataObject.sectionKey belongs to that section).
Open threads anchored directly at the whole-record level (AnchorType === 'Record').
Total unresolved anchored threads visible to the user on this record.
Total resolved anchored threads visible to the user on this record.
Aggregated open and resolved comment counts across a record's fields, sections, left-nav rail groups, and contributions.