GTM API / LinkedIn account activity-log metrics

Period-bound aggregates over a filtered activity-log set (avg plugin duration, avg pending age) plus the counts block and an optional group_by axis (action_type | status | linkedin_account_sid). Use for: "what was done today/this week grouped by action_type", at-a-glance fail rate (group_by status). Guardrail (high-write table): period {from,to} is REQUIRED and filter must include linkedin_account_sid.eq/.in. Unbounded scans are rejected; window may not exceed 90 days. The filter here is NARROWER than search: linkedin_account_sid and status are the only axes the aggregation applies. Slice any other dimension with group_by, or use search. Contract: - MCP tool get_linkedin_account_activity_log_metrics, registry package mcp.linkedin/linkedin_account_activity_log, mount linkedin.account-monitor. - Operation metrics, response envelope metrics. - Flags: read only.