Period-bound delivery health: success_rate, failure_rate, p50 / p95 / p99 latency, total_retries, last_success_at and last_failure_at. The rates count terminal rows only (a delivery still on its ladder is in counts.groups.status.retrying, not here); a period with nothing terminal reads null. period {from, to} is required; filter is the search filter (created_at inside it is ignored, period is the window); group_by splits by status, event_type, response_code, webhook_sid or account_sid.

Contract:

• MCP tool get_webhook_logs_metrics, registry package mcp.integrations/webhook_logs, mount integrations.webhooks.
• Operation metrics, response envelope metrics.
• Flags: read only.