prometheus/docs/querying/api.md

title	sort_rank
HTTP API	7

HTTP API

The current stable HTTP API is reachable under /api/v1 on a Prometheus server. Any non-breaking additions will be added under that endpoint.

Format overview

The API response format is JSON. Every successful API request returns a 2xx status code.

Invalid requests that reach the API handlers return a JSON error object and one of the following HTTP response codes:

• 400 Bad Request when parameters are missing or incorrect.
• 422 Unprocessable Entity when an expression can't be executed (RFC4918).
• 503 Service Unavailable when queries time out or abort.

Other non-2xx codes may be returned for errors occurring before the API endpoint is reached.

The JSON response envelope format is as follows:

{
  "status": "success" | "error",
  "data": <data>,

  // Only set if status is "error". The data field may still hold
  // additional data.
  "errorType": "<string>",
  "error": "<string>"
}

Input timestamps may be provided either in RFC3339 format or as a Unix timestamp in seconds, with optional decimal places for sub-second precision. Output timestamps are always represented as Unix timestamps in seconds.

Names of query parameters that may be repeated end with [].

<series_selector> placeholders refer to Prometheus time series selectors like http_requests_total or http_requests_total{method=~"(GET|POST)"} and need to be URL-encoded.

<duration> placeholders refer to Prometheus duration strings of the form [0-9]+[smhdwy]. For example, 5m refers to a duration of 5 minutes.

Expression queries

Query language expressions may be evaluated at a single instant or over a range of time. The sections below describe the API endpoints for each type of expression query.

Instant queries

The following endpoint evaluates an instant query at a single point in time:

GET /api/v1/query

URL query parameters:

• query=<string>: Prometheus expression query string.
• time=<rfc3339 | unix_timestamp>: Evaluation timestamp. Optional.
• timeout=<duration>: Evaluation timeout. Optional. Defaults to and is capped by the value of the -query.timeout flag.

The current server time is used if the time parameter is omitted.

The data section of the query result has the following format:

{
  "resultType": "matrix" | "vector" | "scalar" | "string",
  "result": <value>
}

<value> refers to the query result data, which has varying formats depending on the resultType. See the expression query result formats.

The following example evaluates the expression up at the time 2015-07-01T20:10:51.781Z:

$ curl 'http://localhost:9090/api/v1/query?query=up&time=2015-07-01T20:10:51.781Z'
{
   "status" : "success",
   "data" : {
      "resultType" : "vector",
      "result" : [
         {
            "metric" : {
               "__name__" : "up",
               "job" : "prometheus",
               "instance" : "localhost:9090"
            },
            "value": [ 1435781451.781, "1" ]
         },
         {
            "metric" : {
               "__name__" : "up",
               "job" : "node",
               "instance" : "localhost:9100"
            },
            "value" : [ 1435781451.781, "0" ]
         }
      ]
   }
}

Range queries

The following endpoint evaluates an expression query over a range of time:

GET /api/v1/query_range

URL query parameters:

• query=<string>: Prometheus expression query string.
• start=<rfc3339 | unix_timestamp>: Start timestamp.
• end=<rfc3339 | unix_timestamp>: End timestamp.
• step=<duration>: Query resolution step width.
• timeout=<duration>: Evaluation timeout. Optional. Defaults to and is capped by the value of the -query.timeout flag.

The data section of the query result has the following format:

{
  "resultType": "matrix",
  "result": <value>
}

For the format of the <value> placeholder, see the range-vector result format.

The following example evaluates the expression up over a 30-second range with a query resolution of 15 seconds.

$ curl 'http://localhost:9090/api/v1/query_range?query=up&start=2015-07-01T20:10:30.781Z&end=2015-07-01T20:11:00.781Z&step=15s'
{
   "status" : "success",
   "data" : {
      "resultType" : "matrix",
      "result" : [
         {
            "metric" : {
               "__name__" : "up",
               "job" : "prometheus",
               "instance" : "localhost:9090"
            },
            "values" : [
               [ 1435781430.781, "1" ],
               [ 1435781445.781, "1" ],
               [ 1435781460.781, "1" ]
            ]
         },
         {
            "metric" : {
               "__name__" : "up",
               "job" : "node",
               "instance" : "localhost:9091"
            },
            "values" : [
               [ 1435781430.781, "0" ],
               [ 1435781445.781, "0" ],
               [ 1435781460.781, "1" ]
            ]
         }
      ]
   }
}

Querying metadata

Finding series by label matchers

The following endpoint returns the list of time series that match a certain label set.

GET /api/v1/series

URL query parameters:

• match[]=<series_selector>: Repeated series selector argument that selects the series to return. At least one match[] argument must be provided.
• start=<rfc3339 | unix_timestamp>: Start timestamp.
• end=<rfc3339 | unix_timestamp>: End timestamp.

The data section of the query result consists of a list of objects that contain the label name/value pairs which identify each series.

The following example returns all series that match either of the selectors up or process_start_time_seconds{job="prometheus"}:

$ curl -g 'http://localhost:9090/api/v1/series?match[]=up&match[]=process_start_time_seconds{job="prometheus"}'
{
   "status" : "success",
   "data" : [
      {
         "__name__" : "up",
         "job" : "prometheus",
         "instance" : "localhost:9090"
      },
      {
         "__name__" : "up",
         "job" : "node",
         "instance" : "localhost:9091"
      },
      {
         "__name__" : "process_start_time_seconds",
         "job" : "prometheus",
         "instance" : "localhost:9090"
      }
   ]
}

Querying label values

The following endpoint returns a list of label values for a provided label name:

GET /api/v1/label/<label_name>/values

The data section of the JSON response is a list of string label names.

This example queries for all label values for the job label:

$ curl http://localhost:9090/api/v1/label/job/values
{
   "status" : "success",
   "data" : [
      "node",
      "prometheus"
   ]
}

Expression query result formats

Expression queries may return the following response values in the result property of the data section. <sample_value> placeholders are numeric sample values. JSON does not support special float values such as NaN, Inf, and -Inf, so sample values are transferred as quoted JSON strings rather than raw numbers.

Range vectors

Range vectors are returned as result type matrix. The corresponding result property has the following format:

[
  {
    "metric": { "<label_name>": "<label_value>", ... },
    "values": [ [ <unix_time>, "<sample_value>" ], ... ]
  },
  ...
]

Instant vectors

Instant vectors are returned as result type vector. The corresponding result property has the following format:

[
  {
    "metric": { "<label_name>": "<label_value>", ... },
    "value": [ <unix_time>, "<sample_value>" ]
  },
  ...
]

Scalars

Scalar results are returned as result type scalar. The corresponding result property has the following format:

[ <unix_time>, "<scalar_value>" ]

Strings

String results are returned as result type string. The corresponding result property has the following format:

[ <unix_time>, "<string_value>" ]

Targets

This API is experimental as it is intended to be extended with targets dropped due to relabelling in the future.

The following endpoint returns an overview of the current state of the Prometheus target discovery:

GET /api/v1/targets

Currently only the active targets are part of the response.

$ curl http://localhost:9090/api/v1/targets
{
  "status": "success",                                                                                                                                [3/11]
  "data": {
    "activeTargets": [
      {
        "discoveredLabels": {
          "__address__": "127.0.0.1:9090",
          "__metrics_path__": "/metrics",
          "__scheme__": "http",
          "job": "prometheus"
        },
        "labels": {
          "instance": "127.0.0.1:9090",
          "job": "prometheus"
        },
        "scrapeUrl": "http://127.0.0.1:9090/metrics",
        "lastError": "",
        "lastScrape": "2017-01-17T15:07:44.723715405+01:00",
        "health": "up"
      }
    ]
  }
}

Alertmanagers

This API is experimental as it is intended to be extended with Alertmanagers dropped due to relabelling in the future.

The following endpoint returns an overview of the current state of the Prometheus alertmanager discovery:

GET /api/v1/alertmanagers

Currently only the active Alertmanagers are part of the response.

$ curl http://localhost:9090/api/v1/alertmanagers
{
  "status": "success",
  "data": {
    "activeAlertmanagers": [
      {
        "url": "http://127.0.0.1:9090/api/v1/alerts"
      }
    ]
  }
}

TSDB Admin APIs

In 2.0, there are new APIs that expose database functionalities for the advanced user. These APIs are not enabled unless the --web.enable-admin-api is set. All the APIs below are experimental and might change in the future.

We also expose a gRPC API whose definition can be found here.

Snapshot

Snapshot creates a snapshot of all current data into snapshots/<datetime>-<rand> under the TSDB's data directory and returns the directory as response.

POST /api/v2/admin/tsdb/snapshot

$ curl -XPOST http://localhost:9090/api/v2/admin/tsdb/snapshot
{
  "name": "2017-11-30T15:31:59Z-2366f0a55106d6e1"
}

The snapshot now exists at <data-dir>/snapshots/2017-11-30T15:31:59Z-2366f0a55106d6e1

Delete Series

DeleteSeries deletes data for a selection of series in a time range. The actual data still exists on disk and is cleaned up in future compactions or can be explicitly cleaned up by hitting the Clean Tombstones endpoint.

POST /api/v2/admin/tsdb/delete_series

Parameters (body):

{
    "min_time": "date-time(iso-8601)" // optional, defaults to minmum-time.
    "max_time": "date-time(iso-8601)" // optional, defaults to maximum-time
     "matchers": [LabelMatcher]
}

LabelMatchers: Matcher specifies a rule, which can match or set of labels or not.

{
  "type": "string", // One of: EQ, NEQ, RE, NRE defaults to EQ. 
  "name": "label-name",
  "value": "label-value"
}

Example:

$ curl -X POST \                                                              
  http://localhost:9090/api/v2/admin/tsdb/delete_series \
  -H 'content-type: application/json' \
  -d '{
        "max_time": "'2017-11-30T20:18:30+05:30",
        "matchers": [{
                "type": "EQ",
                "name": "__name__",
                "value": "up"
        }]
    }'
    
{}    

Clean Tombstones

CleanTombstones removes the deleted data from disk and cleans up the existing tombstones. This can be used after deleting series to free up space.

POST /api/v2/admin/tsdb/clean_tombstones

This takes no parameters or body.

$ curl -XPOST http://localhost:9090/api/v2/admin/tsdb/clean_tombstones
{}