Evaluations HTTP API

The /evaluation endpoints are used to query for and interact with evaluations.

List Evaluations

This endpoint lists all evaluations.

Method	Path	Produces
`GET`	`/v1/evaluations`	`application/json`

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries	ACL Required
`YES`	`namespace:read-job`

Parameters

prefix (string: "")- Specifies a string to filter evaluations based on an ID prefix. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter and is used before any filter expression is applied.
next_token (string: "") - This endpoint supports paging. The next_token parameter accepts a string which is the ID field of the next expected evaluation. This value can be obtained from the X-Nomad-NextToken header from the previous response.
per_page (int: 0) - Specifies a maximum number of evaluations to return for this request. If omitted, the response is not paginated. The ID of the last evaluation in the response can be used as the last_token of the next request to fetch additional pages.
filter (string: "") - Specifies the expression used to filter the results. Consider using pagination or a query parameter to reduce resource used to serve the request.
job (string: "") - Filter the list of evaluations to a specific job ID.
status (string: "") - Filter the list of evaluations to a specific evaluation status (one of blocked, pending, complete, failed, or canceled).
namespace (string: "default") - Specifies the target namespace. Specifying * will return all evaluations across all authorized namespaces. This parameter is used before any filter expression is applied.
reverse (bool: false) - Specifies the list of returned evaluations should be sorted in the reverse order. By default evaluations are returned sorted in chronological order (older evaluations first), or in lexicographical order by their ID if the prefix query parameter is used.

Sample Request

$ curl \
    https://localhost:4646/v1/evaluations

$ curl \
    https://localhost:4646/v1/evaluations?prefix=25ba81

Sample Response

[
  {
    "ID": "5456bd7a-9fc0-c0dd-6131-cbee77f57577",
    "Priority": 50,
    "Type": "service",
    "TriggeredBy": "job-register",
    "JobID": "example",
    "JobModifyIndex": 52,
    "NodeID": "",
    "NodeModifyIndex": 0,
    "Status": "complete",
    "StatusDescription": "",
    "Wait": 0,
    "NextEval": "",
    "PreviousEval": "",
    "BlockedEval": "",
    "FailedTGAllocs": null,
    "ClassEligibility": null,
    "EscapedComputedClass": false,
    "AnnotatePlan": false,
    "SnapshotIndex": 53,
    "QueuedAllocations": {
      "cache": 0
    },
    "CreateIndex": 53,
    "ModifyIndex": 55
  }
]

Read Evaluation

This endpoint reads information about a specific evaluation by ID.

Method	Path	Produces
`GET`	`/v1/evaluation/:eval_id`	`application/json`

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries	ACL Required
`YES`	`namespace:read-job`

Parameters

:eval_id (string: <required>)- Specifies the UUID of the evaluation. This must be the full UUID, not the short 8-character one. This is specified as part of the path.
related (bool: false) - Specifies if related evaluations should be returned. Related evaluations are the ones that can be reached by following the trail of IDs for NextEval, PreviousEval, and BlockedEval. This is specified as a query parameter.

Sample Request

$ curl \
    https://localhost:4646/v1/evaluation/2deb5f06-a100-f01a-3316-5e501a4965e7?related=true

Sample Response

{
  "CreateIndex": 28,
  "CreateTime": 1647394818583344000,
  "FailedTGAllocs": {
    "cache": {
      "AllocationTime": 4111,
      "ClassExhausted": null,
      "ClassFiltered": null,
      "CoalescedFailures": 0,
      "ConstraintFiltered": null,
      "DimensionExhausted": null,
      "NodesAvailable": {
        "dc1": 0
      },
      "NodesEvaluated": 0,
      "NodesExhausted": 0,
      "NodesFiltered": 0,
      "QuotaExhausted": null,
      "ResourcesExhausted": null,
      "ScoreMetaData": null,
      "Scores": null
    }
  },
  "ID": "2deb5f06-a100-f01a-3316-5e501a4965e7",
  "JobID": "example",
  "ModifyIndex": 28,
  "ModifyTime": 1647394818583344000,
  "Namespace": "default",
  "PreviousEval": "0f98f7ea-59ae-4d90-d9bd-b8ce80b9e100",
  "Priority": 50,
  "RelatedEvals": [
    {
      "BlockedEval": "2deb5f06-a100-f01a-3316-5e501a4965e7",
      "CreateIndex": 27,
      "CreateTime": 1647394818582736000,
      "DeploymentID": "79ae0a49-acf6-0fcf-183f-8646f3167b88",
      "ID": "0f98f7ea-59ae-4d90-d9bd-b8ce80b9e100",
      "JobID": "example",
      "ModifyIndex": 30,
      "ModifyTime": 1647394818583565000,
      "Namespace": "default",
      "NextEval": "",
      "NodeID": "",
      "PreviousEval": "",
      "Priority": 50,
      "Status": "complete",
      "StatusDescription": "",
      "TriggeredBy": "node-drain",
      "Type": "service",
      "WaitUntil": null
    }
  ],
  "SnapshotIndex": 27,
  "Status": "blocked",
  "StatusDescription": "created to place remaining allocations",
  "TriggeredBy": "queued-allocs",
  "Type": "service"
}

Delete Evaluations

This endpoint deletes evaluations. In order to utilise this endpoint the eval broker should be paused via the operator scheduler update configuration API endpoint.

This API endpoint should be used cautiously and only in outage situations where there is a large backlog of evaluations not being processed. During most normal and outage scenarios, Nomad's reconciliation and state management will handle evaluations as needed.

Method	Path	Produces
`DELETE`	`/v1/evaluations`	`application/json`

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries	ACL Required
`NO`	`management`

Parameters

EvalIDs (array<string>: <required>)- An array of evaluation UUIDs to delete. This must be a full length UUID and not a prefix.

Sample Payload

{
  "EvalIDs": [
    "167ec27d-2e36-979a-280a-a6b920d382db",
    "6c193955-ac66-42e2-f4c7-f1fc707f1f5e"
  ]
}

Sample Request

$ curl \
    --request DELETE \
    --data @payload.json \
    https://localhost:4646/v1/evaluations

List Allocations for Evaluation

This endpoint lists the allocations created or modified for the given evaluation.

Method	Path	Produces
`GET`	`/v1/evaluation/:eval_id/allocations`	`application/json`

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries	ACL Required
`YES`	`namespace:read-job`

Parameters

:eval_id (string: <required>)- Specifies the UUID of the evaluation. This must be the full UUID, not the short 8-character one. This is specified as part of the path.

Sample Request

$ curl \
    https://localhost:4646/v1/evaluation/5456bd7a-9fc0-c0dd-6131-cbee77f57577/allocations

Sample Response

[
  {
    "ID": "a8198d79-cfdb-6593-a999-1e9adabcba2e",
    "EvalID": "5456bd7a-9fc0-c0dd-6131-cbee77f57577",
    "Name": "example.cache[0]",
    "NodeID": "fb2170a8-257d-3c64-b14d-bc06cc94e34c",
    "JobID": "example",
    "TaskGroup": "cache",
    "DesiredStatus": "run",
    "DesiredDescription": "",
    "ClientStatus": "running",
    "ClientDescription": "",
    "TaskStates": {
      "redis": {
        "State": "running",
        "Failed": false,
        "Events": [
          {
            "Type": "Received",
            "Time": 1495747371795703800,
            "FailsTask": false,
            "RestartReason": "",
            "SetupError": "",
            "DriverError": "",
            "ExitCode": 0,
            "Signal": 0,
            "Message": "",
            "KillTimeout": 0,
            "KillError": "",
            "KillReason": "",
            "StartDelay": 0,
            "DownloadError": "",
            "ValidationError": "",
            "DiskLimit": 0,
            "FailedSibling": "",
            "VaultError": "",
            "TaskSignalReason": "",
            "TaskSignal": "",
            "DriverMessage": ""
          },
          {
            "Type": "Driver",
            "Time": 1495747371798867200,
            "FailsTask": false,
            "RestartReason": "",
            "SetupError": "",
            "DriverError": "",
            "ExitCode": 0,
            "Signal": 0,
            "Message": "",
            "KillTimeout": 0,
            "KillError": "",
            "KillReason": "",
            "StartDelay": 0,
            "DownloadError": "",
            "ValidationError": "",
            "DiskLimit": 0,
            "FailedSibling": "",
            "VaultError": "",
            "TaskSignalReason": "",
            "TaskSignal": "",
            "DriverMessage": "Downloading image redis:7"
          },
          {
            "Type": "Started",
            "Time": 1495747379525667800,
            "FailsTask": false,
            "RestartReason": "",
            "SetupError": "",
            "DriverError": "",
            "ExitCode": 0,
            "Signal": 0,
            "Message": "",
            "KillTimeout": 0,
            "KillError": "",
            "KillReason": "",
            "StartDelay": 0,
            "DownloadError": "",
            "ValidationError": "",
            "DiskLimit": 0,
            "FailedSibling": "",
            "VaultError": "",
            "TaskSignalReason": "",
            "TaskSignal": "",
            "DriverMessage": ""
          }
        ]
      }
    },
    "CreateIndex": 54,
    "ModifyIndex": 57,
    "CreateTime": 1495747371794276400
  }
]

Count Evaluations

This endpoint counts evaluations. Note that Nomad's state store architecture makes calculating this count unexpectedly expensive (similar in cost to the List API), and this API was designed for use during recovery operations with the nomad eval delete command. It is not recommended to use this API for monitoring. The nomad.nomad.broker.* metrics are better for that use case. See the metrics reference for details.

Method	Path	Produces
`GET`	`/v1/evaluations/count`	`application/json`

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking Queries	ACL Required
`YES`	`namespace:read-job`

Parameters

prefix (string: "")- Specifies a string to filter evaluations based on an ID prefix. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter and is used before any filter expression is applied.
filter (string: "") - Specifies the expression used to filter the results.
namespace (string: "default") - Specifies the target namespace. Specifying * will return all evaluations across all authorized namespaces. This parameter is used before any filter expression is applied.

Sample Request

$ curl \
    https://localhost:4646/v1/evaluations/count

$ curl \
    https://localhost:4646/v1/evaluations/count?prefix=25ba81

Sample Response

{
  "Count": 36
  "Index": 133,
  "KnownLeader": true,
  "LastContact": 0,
  "NextToken": ""
}