Query Usage
Cumulative usage series for the inbox. Each point is the running total
of the usage type at that timestamp, not the change within the bucket.
Inbox-scoped queries carry storage_bytes, message_count, and
thread_count; requested types that don't apply to the scope are
ignored. Defaults to the last 24 hours; start must be within the
last 90 days, and a future end is clamped to now. The range divided
by period must not exceed 1000 buckets.