Data Api Metric Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/google-analytics/refs/heads/main/json-structure/data-api-metric-structure.json",
  "name": "Metric",
  "description": "The quantitative measurements of a report. For example, the metric `eventCount` is the total number of events. Requests are allowed up to 10 metrics.",
  "type": "object",
  "properties": {
    "expression": {
      "description": "A mathematical expression for derived metrics. For example, the metric Event count per user is `eventCount/totalUsers`.",
      "type": "string"
    },
    "invisible": {
      "description": "Indicates if a metric is invisible in the report response. If a metric is invisible, the metric will not produce a column in the response, but can be used in `metricFilter`, `orderBys`, or a metric `expression`.",
      "type": "boolean"
    },
    "name": {
      "description": "The name of the metric. See the [API Metrics](https://developers.google.com/analytics/devguides/reporting/data/v1/api-schema#metrics) for the list of metric names supported by core reporting methods such as `runReport` and `batchRunReports`. See [Realtime Metrics](https://developers.google.com/analytics/devguides/reporting/data/v1/realtime-api-schema#metrics) for the list of metric names supported by the `runRealtimeReport` method. See [Funnel Metrics](https://developers.google.com/analytics/devguides/reporting/data/v1/exploration-api-schema#metrics) for the list of metric names supported by the `runFunnelReport` method. If `expression` is specified, `name` can be any string that you would like within the allowed character set. For example if `expression` is `screenPageViews/sessions`, you could call that metric's name = `viewsPerSession`. Metric names that you choose must match the regular expression `^[a-zA-Z0-9_]$`. Metrics are referenced by `name` in `metricFilter`, `orderBys`, and metric `expression`.",
      "type": "string"
    }
  }
}