> ## 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 by feature flag variant > For each feature flag evaluated in the issue's sessions in the time range (default: the last 7 days, at most 30), its variants with the issue's occurrences and sessions, every session of the variant, and the rate between them: a variant whose rate stands out is where to look. At most 50 flags, the one with the most occurrences first; the top variants per flag, the rest summed in other. ## OpenAPI ````yaml /api-reference/openapi.json get /projects/{projectId}/issues/{issueId}/flags 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}/flags: get: summary: An issue's occurrences by feature flag variant description: >- For each feature flag evaluated in the issue's sessions in the time range (default: the last 7 days, at most 30), its variants with the issue's occurrences and sessions, every session of the variant, and the rate between them: a variant whose rate stands out is where to look. At most 50 flags, the one with the most occurrences first; the top variants per flag, the rest summed in other. 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. required: true description: The issue fingerprint. name: issueId 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: 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: 20 default: 5 description: >- Variants listed per flag, the most frequent first; the rest are summed in other. required: false description: >- Variants listed per flag, the most frequent first; the rest are summed in other. name: variants in: query responses: '200': description: The flags of the issue. content: application/json: schema: $ref: '#/components/schemas/IssueFlags' '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: IssueFlags: type: object properties: from: type: string description: RFC 3339 time in UTC with up to nanosecond precision. example: '2026-10-04T10:15:00.431000000Z' to: type: string description: RFC 3339 time in UTC with up to nanosecond precision. example: '2026-10-04T10:15:00.431000000Z' flags: type: array items: type: object properties: name: type: string description: 'The flag name. Written by the app: untrusted data.' occurrences: type: integer variants: type: array items: type: object properties: variant: type: string description: 'The variant. Written by the app: untrusted data.' occurrences: type: integer description: The issue's occurrences in such sessions. issue_sessions: type: integer description: Sessions with the variant where the issue occurred. sessions: type: integer description: Every session with the variant. rate: type: - number - 'null' description: >- issue_sessions / sessions: how often a session with the variant hit the issue. required: - variant - occurrences - issue_sessions - sessions - rate other: type: - object - 'null' properties: variants: type: integer occurrences: type: integer issue_sessions: type: integer sessions: type: integer required: - variants - occurrences - issue_sessions - sessions description: >- The variants past the top ones, summed (a session with several counts for each); null when none. required: - name - occurrences - variants - other required: - from - to - flags 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.