Returns merged PR/MR counts grouped by platform login for the organization, filtered by VCS source (github or gitlab). With granularity=day, returns one row per (login, calendar day) instead of a single per-login total; days are UTC calendar dates (the underlying metric_date has no time component) and are zero-filled for logins with at least one merged PR in range, so quiet days are returned as 0 rather than omitted. Days older than the trailing ~30-day sync window are frozen at their last sync and may miss late-recorded activity; day-level history exists from the org's first sync onward. granularity=day is capped at 35 days per request; use granularity=window for longer ranges. granularity=week or month returns one row per (login, bucket) instead, zero-filled per bucket rather than per day; weeks are ISO-8601 (Monday start) and months are calendar months, both in UTC. week and month are capped at 400 days per request.