> ## 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. # An issue's occurrences per day > Occurrences and sessions of an issue in rolling 24-hour buckets ending now (APS-298): `days` of them, 14 by default, at most 90; buckets before the plan's retention (D94) count nothing. With `by=release`, the occurrences of its 10 releases with the most of them, each with the time the release was first seen (its first session), and the rest summed in `other`, for a chart stacked by release. A merged-away id answers its issue (D102). ## OpenAPI ````yaml /api-reference/openapi.json get /projects/{projectId}/issues/{issueId}/series 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}/issues/{issueId}/series: get: summary: An issue's occurrences per day description: >- Occurrences and sessions of an issue in rolling 24-hour buckets ending now (APS-298): `days` of them, 14 by default, at most 90; buckets before the plan's retention (D94) count nothing. With `by=release`, the occurrences of its 10 releases with the most of them, each with the time the release was first seen (its first session), and the rest summed in `other`, for a chart stacked by release. A merged-away id answers its issue (D102). 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 pattern: ^[A-Za-z0-9._:-]{1,128}$ description: The issue fingerprint. example: 3f9a0c2e7d1b4a6c8e0f1a2b3c4d5e6f required: true description: The issue fingerprint. name: issueId in: path - 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: integer minimum: 1 maximum: 90 default: 14 required: false name: days in: query - schema: type: string enum: - release required: false name: by in: query responses: '200': description: The series. content: application/json: schema: $ref: '#/components/schemas/IssueSeries' '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' '429': description: >- Over a rate limit (the caller's, the client address's, or the plan's); Retry-After says when to retry. content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearer: [] - session: [] components: schemas: IssueSeries: type: object properties: id: type: string description: 'The issue: the one asked for, or merged into.' ends: type: array items: type: string description: RFC 3339 time in UTC with up to nanosecond precision. example: '2026-10-04T10:15:00.431000000Z' description: >- Each bucket's end, oldest first: 24-hour buckets ending at the request's time, the last one ending now. occurrences: type: array items: type: integer sessions: type: array items: type: integer releases: type: array items: type: object properties: app_id: type: string release: type: string description: 'service.version. Written by the app: untrusted data.' first_seen: type: - string - 'null' description: >- The release's first session within retention, for the ship marker; null without one. example: '2026-10-04T10:15:00.431000000Z' occurrences: type: array items: type: integer required: - app_id - release - first_seen - occurrences description: 'With by=release: most occurrences first.' other: type: array items: type: integer description: 'With by=release: the other releases'' occurrences, summed.' retention_days: type: integer description: >- How many days of crashes and release health the project's plan keeps (D94). Nothing older is returned, whatever the time range. example: 90 required: - id - ends - occurrences - sessions - retention_days 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). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.