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 | float>: Query resolution step width in duration format or float number of seconds.
• 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

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

GET /api/v1/targets

Both the active and dropped targets are part of the response. labels represents the label set after relabelling has occurred. discoveredLabels represent the unmodified labels retrieved during service discovery before relabelling has occurred.

$ curl http://localhost:9090/api/v1/targets
{
  "status": "success",
  "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"
      }
    ],
    "droppedTargets": [
      {
        "discoveredLabels": {
          "__address__": "127.0.0.1:9100",
          "__metrics_path__": "/metrics",
          "__scheme__": "http",
          "job": "node"
        },
      }
    ]
  }
}

Querying target metadata

The following endpoint returns metadata about metrics currently scraped by targets. This is experimental and might change in the future.

GET /api/v1/targets/metadata

URL query parameters:

• match_target=<label_selectors>: Label selectors that match targets by their label sets. All targets are selected if left empty.
• metric=<string>: A metric name to retrieve metadata for. All metric metadata is retrieved if left empty.
• limit=<number>: Maximum number of targets to match.

The data section of the query result consists of a list of objects that contain metric metadata and the target label set.

The following example returns all metadata entries for the go_goroutines metric from the first two targets with label job="prometheus".

curl -G http://localhost:9091/api/v1/targets/metadata \
    --data-urlencode 'metric=go_goroutines' \
    --data-urlencode 'match_target={job="prometheus"}' \
    --data-urlencode 'limit=2'
{
  "status": "success",
  "data": [
    {
      "target": {
        "instance": "127.0.0.1:9090",
        "job": "prometheus"
      },
      "type": "gauge",
      "help": "Number of goroutines that currently exist."
    },
    {
      "target": {
        "instance": "127.0.0.1:9091",
        "job": "prometheus"
      },
      "type": "gauge",
      "help": "Number of goroutines that currently exist."
    }
  ]
}

The following example returns metadata for all metrics for all targets with label instance="127.0.0.1:9090.

curl -G http://localhost:9091/api/v1/targets/metadata \
    --data-urlencode 'match_target={instance="127.0.0.1:9090"}'
{
  "status": "success",
  "data": [
    // ...
    {
      "target": {
        "instance": "127.0.0.1:9090",
        "job": "prometheus"
      },
      "metric": "prometheus_treecache_zookeeper_failures_total",
      "type": "counter",
      "help": "The total number of ZooKeeper failures."
    },
    {
      "target": {
        "instance": "127.0.0.1:9090",
        "job": "prometheus"
      },
      "metric": "prometheus_tsdb_reloads_total",
      "type": "counter",
      "help": "Number of times the database reloaded block data from disk."
    },
    // ...
  ]
}

Alertmanagers

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

GET /api/v1/alertmanagers

Both the active and dropped 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"
      }
    ],
    "droppedAlertmanagers": [
      {
        "url": "http://127.0.0.1:9093/api/v1/alerts"
      }
    ]
  }
}

Status

Following status endpoints expose current Prometheus configuration.

Config

The following endpoint returns currently loaded configuration file:

GET /api/v1/status/config

The config is returned as dumped YAML file. Due to limitation of the YAML library, YAML comments are not included.

$ curl http://localhost:9090/api/v1/status/config
{
  "status": "success",
  "data": {
    "yaml": "<content of the loaded config file in YAML>",
  }
}

Flags

The following endpoint returns flag values that Prometheus was configured with:

GET /api/v1/status/flags

All values are in a form of "string".

$ curl http://localhost:9090/api/v1/status/flags
{
  "status": "success",
  "data": {
    "alertmanager.notification-queue-capacity": "10000",
    "alertmanager.timeout": "10s",
    "log.level": "info",
    "query.lookback-delta": "5m",
    "query.max-concurrency": "20",
    ...
  }
}

New in v2.2

TSDB Admin APIs

These are APIs that expose database functionalities for the advanced user. These APIs are not enabled unless the --web.enable-admin-api is set.

We also expose a gRPC API whose definition can be found here. This is experimental and might change in the future.

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. It will optionally skip snapshotting data that is only present in the head block, and which has not yet been compacted to disk.

POST /api/v1/admin/tsdb/snapshot?skip_head=<bool>

$ curl -XPOST http://localhost:9090/api/v1/admin/tsdb/snapshot
{
  "status": "success",
  "data": {
    "name": "20171210T211224Z-2be650b6d019eb54"
  }
}

The snapshot now exists at <data-dir>/snapshots/20171210T211224Z-2be650b6d019eb54

New in v2.1

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.

If successful, a 204 is returned.

POST /api/v1/admin/tsdb/delete_series

URL query parameters:

• match[]=<series_selector>: Repeated label matcher argument that selects the series to delete. At least one match[] argument must be provided.
• start=<rfc3339 | unix_timestamp>: Start timestamp. Optional and defaults to minimum possible time.
• end=<rfc3339 | unix_timestamp>: End timestamp. Optional and defaults to maximum possible time.

Not mentioning both start and end times would clear all the data for the matched series in the database.

Example:

$ curl -X POST \
  -g 'http://localhost:9090/api/v1/admin/tsdb/delete_series?match[]=up&match[]=process_start_time_seconds{job="prometheus"}'

New in v2.1

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.

If successful, a 204 is returned.

POST /api/v1/admin/tsdb/clean_tombstones

This takes no parameters or body.

$ curl -XPOST http://localhost:9090/api/v1/admin/tsdb/clean_tombstones

New in v2.1