Aggregate normalized post metrics across a window of sent posts, without paginating through individual posts. Available for personal workflows and automations only, using a personal API key.

The returned `metrics` array always includes a baseline trio — `postCount`, `reactions`, and `comments`. Beyond those, additional metric types are included only when every channel in the filter set supports them.

```graphql
query AggregatePostMetrics {
  aggregatedPostMetrics(
    input: {
      organizationId: "some_organization_id"
      startDateTime: "2026-01-01T00:00:00Z"
      endDateTime: "2026-03-31T23:59:59Z"
      channelIds: ["some_channel_id"]
    }
  ) {
    metrics {
      type
      value
      unit
    }
    metricsUpdatedAt
  }
}
```