/systems/{id}/alerts/silences - Create a silence for a system alert

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POST /systems/{id}/alerts/silences
Bearer auth

Creates an Alertmanager silence for a specific active alert on the target system. The request identifies the live alert by fingerprint. The backend resolves the alert, builds the silence matchers server-side, and always uses the system's authoritative system_key. If end_at is provided it takes precedence over duration_minutes. Requires manage:systems permission.

Path parameters

  • id string Required

    System ID (database UUID)

application/json

Body Required

  • fingerprint string Required

    Fingerprint of the active alert to silence

  • comment string

    Optional silence comment. Defaults to a system-generated value when empty.

  • duration_minutes integer

    Optional silence duration in minutes. Defaults to 60 when omitted. Ignored when end_at is set.

    Minimum value is 1, maximum value is 10080.

  • end_at string(date-time)

    Optional explicit end time (RFC3339). Takes precedence over duration_minutes.

Responses

  • 200 application/json

    Alert silence created successfully

    Hide response attributes Show response attributes object
    • code integer
    • message string
    • data object
      Hide data attribute Show data attribute object
      • silence_id string
  • 400 application/json

    Validation failed. data.type is always validation_error. data.errors[] lists per-field failures with stable message codes the UI consumes for i18n: required (missing field), invalid_format (bad fingerprint regex or non-RFC3339 end_at), must_be_future (end_at in the past), max / min (out of range duration_minutes).

    Hide response attributes Show response attributes object
    • code integer

      HTTP error code

    • message string

      Error message

    • data object
      Hide data attributes Show data attributes object
      • type string

        Type of error

        Values are validation_error or external_api_error.

      • errors array[object]
        Hide errors attributes Show errors attributes object
        • key string

          Field name that failed validation

        • message string

          Error code or message

        • value string

          Value that failed validation

      • details

        Additional error details
  • 401 application/json

    Unauthorized - invalid or missing token

    Hide response attributes Show response attributes object
    • code integer
    • message string
    • data object | null
  • 403 application/json

    Forbidden - insufficient permissions

    Hide response attributes Show response attributes object
    • code integer
    • message string
    • data object | null
  • 404 application/json

    Resource not found

    Hide response attributes Show response attributes object
    • code integer

      HTTP error code

    • message string

      Error message

    • data object
      Hide data attributes Show data attributes object
      • type string

        Type of error

        Values are validation_error or external_api_error.

      • errors array[object]
        Hide errors attributes Show errors attributes object
        • key string

          Field name that failed validation

        • message string

          Error code or message

        • value string

          Value that failed validation

      • details

        Additional error details
POST /systems/{id}/alerts/silences 
curl \
 --request POST 'https://collect.your-domain.com/api/systems/sys_123456789/alerts/silences' \
 --header "Authorization: Bearer $ACCESS_TOKEN" \
 --header "Content-Type: application/json" \
 --data '{"fingerprint":"0a9d04bb6eed523f","comment":"silenced during maintenance window","end_at":"2026-05-12T09:16:36Z"}'
Request examples
When `end_at` is set, the silence expires at that moment regardless of `duration_minutes`. The backend resolves the alert by `fingerprint`, attaches the system's authoritative `system_key` to the matchers, and creates the silence. 
{
  "fingerprint": "0a9d04bb6eed523f",
  "comment": "silenced during maintenance window",
  "end_at": "2026-05-12T09:16:36Z"
}
Without `end_at`, `duration_minutes` applies. If both are omitted, the silence defaults to 60 minutes from creation. 
{
  "fingerprint": "0a9d04bb6eed523f",
  "comment": "investigating",
  "duration_minutes": 60
}
Response examples (200)
`silence_id` is the Alertmanager-assigned UUID; use it to look up, update, or delete the silence later. The corresponding `silenced` event is appended to the alert's activity timeline (`GET /alerts/activity/{fingerprint}`). 
{
  "code": 200,
  "message": "alert silenced successfully",
  "data": {
    "silence_id": "d9f91c6e-1b33-484e-befa-bfb41020e178"
  }
}
Response examples (400) 
{
  "code": 400,
  "message": "validation failed",
  "data": {
    "type": "validation_error",
    "errors": [
      {
        "key": "fingerprint",
        "message": "required"
      }
    ]
  }
}
{
  "code": 400,
  "message": "validation failed",
  "data": {
    "type": "validation_error",
    "errors": [
      {
        "key": "fingerprint",
        "message": "invalid_format",
        "value": "bad!fingerprint"
      }
    ]
  }
}
{
  "code": 400,
  "message": "validation failed",
  "data": {
    "type": "validation_error",
    "errors": [
      {
        "key": "end_at",
        "message": "invalid_format",
        "value": "not-a-date"
      }
    ]
  }
}
{
  "code": 400,
  "message": "validation failed",
  "data": {
    "type": "validation_error",
    "errors": [
      {
        "key": "end_at",
        "message": "must_be_future",
        "value": "2020-01-01T00:00:00Z"
      }
    ]
  }
}
{
  "code": 400,
  "message": "validation failed",
  "data": {
    "type": "validation_error",
    "errors": [
      {
        "key": "duration_minutes",
        "message": "max",
        "value": "999999"
      }
    ]
  }
}
Response examples (401) 
{
  "code": 401,
  "message": "invalid token",
  "data": {}
}
Response examples (403) 
{
  "code": 403,
  "message": "insufficient permissions",
  "data": {}
}
Response examples (404) 
{
  "code": 400,
  "message": "validation failed",
  "data": {
    "type": "validation_error",
    "errors": [
      {
        "key": "username",
        "message": "required",
        "value": "string"
      }
    ]
  }
}