> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apsio.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Release health

> Sessions, crashes and users per app and release, for sessions that started in the time range (default: the last 7 days). Newest release activity first.



## OpenAPI

````yaml /api-reference/openapi.json get /projects/{projectId}/releases
openapi: 3.1.0
info:
  title: Apsio API
  version: 0.1.0
  description: >-
    Read API v0: your projects, release health and comparisons, missing symbols,
    issues, sessions, vitals, cohort comparisons, performance (app start,
    screens, hangs, MetricKit) and network endpoints and traces for one project.
    Authenticate with a project token as a bearer token, with an OAuth access
    token from Apsio's authorization server (MCP clients), or, from the console,
    with the session cookie of a member of the project's organization.
servers:
  - url: https://api.apsio.io/v1
security: []
paths:
  /projects/{projectId}/releases:
    get:
      summary: Release health
      description: >-
        Sessions, crashes and users per app and release, for sessions that
        started in the time range (default: the last 7 days). Newest release
        activity first.
      parameters:
        - schema:
            type: string
            pattern: ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$
            example: 0192f3a4-0000-7000-8000-00000000a101
          required: true
          name: projectId
          in: path
        - schema:
            type: string
            format: date-time
            description: >-
              Start of the time range, inclusive (RFC 3339). Defaults to the
              range end minus the default length.
            example: '2026-10-01T00:00:00Z'
          required: false
          description: >-
            Start of the time range, inclusive (RFC 3339). Defaults to the range
            end minus the default length.
          name: from
          in: query
        - schema:
            type: string
            format: date-time
            description: End of the time range, exclusive (RFC 3339). Defaults to now.
            example: '2026-10-08T00:00:00Z'
          required: false
          description: End of the time range, exclusive (RFC 3339). Defaults to now.
          name: to
          in: query
        - schema:
            type: integer
            minimum: 1
            maximum: 200
            default: 50
            description: Page size, 1 to 200.
            example: 50
          required: false
          description: Page size, 1 to 200.
          name: limit
          in: query
        - schema:
            type: string
            maxLength: 1024
            description: The `next_cursor` of the previous page. Opaque.
          required: false
          description: The `next_cursor` of the previous page. Opaque.
          name: cursor
          in: query
        - schema:
            type: string
            pattern: ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$
            description: Only this app.
          required: false
          description: Only this app.
          name: app_id
          in: query
        - schema:
            type: string
            maxLength: 128
            description: Only this release.
          required: false
          description: Only this release.
          name: release
          in: query
      responses:
        '200':
          description: Release health, one entry per app and release.
          content:
            application/json:
              schema:
                type: object
                properties:
                  releases:
                    type: array
                    items:
                      $ref: '#/components/schemas/ReleaseHealth'
                  next_cursor:
                    type:
                      - string
                      - 'null'
                    description: >-
                      Pass as `cursor` to get the next page; null on the last
                      page.
                required:
                  - releases
                  - next_cursor
        '400':
          description: The request is not valid.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: No valid bearer token or console session.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The credentials cannot read this project.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      security:
        - bearer: []
        - session: []
components:
  schemas:
    ReleaseHealth:
      type: object
      properties:
        app_id:
          type: string
        release:
          type: string
          description: service.version
          example: 4.12.0
        sessions:
          type: integer
        crashed_sessions:
          type: integer
        abnormal_exit_sessions:
          type: integer
          description: Sessions ended by the system without a crash report (spec 6.4).
        crash_free_sessions_rate:
          type: number
          description: 1 - crashed_sessions / sessions. Abnormal exits are not crashes.
        users:
          type:
            - integer
            - 'null'
          description: Distinct install ids (D41); null when the app sends none.
        crashed_users:
          type:
            - integer
            - 'null'
        crash_free_users_rate:
          type:
            - number
            - 'null'
        first_seen:
          type: string
          description: RFC 3339 time in UTC with up to nanosecond precision.
          example: '2026-10-04T10:15:00.431000000Z'
        last_seen:
          type: string
          description: RFC 3339 time in UTC with up to nanosecond precision.
          example: '2026-10-04T10:15:00.431000000Z'
      required:
        - app_id
        - release
        - sessions
        - crashed_sessions
        - abnormal_exit_sessions
        - crash_free_sessions_rate
        - users
        - crashed_users
        - crash_free_users_rate
        - first_seen
        - last_seen
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              example: invalid_request
            message:
              type: string
          required:
            - code
            - message
      required:
        - error
  securitySchemes:
    bearer:
      type: http
      scheme: bearer
      description: >-
        A project token (apsio_pt_v0...), which reads exactly one project, or an
        OAuth access token issued for the API, which reads what its user can.
        Access tokens issued for Apsio's MCP server are accepted only from the
        MCP server itself.
    session:
      type: apiKey
      in: cookie
      name: apsio_session
      description: >-
        The console session, set by /v1/auth/callback (`__Host-apsio_session`
        when host-only).

````

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