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HTTP JSON Input Plugin

The httpjson plugin collects data from HTTP URLs which respond with JSON. It flattens the JSON and finds all numeric values, treating them as floats.

Configuration:

[[inputs.httpjson]]
  ## NOTE This plugin only reads numerical measurements, strings and booleans
  ## will be ignored.

  ## Name for the service being polled.  Will be appended to the name of the
  ## measurement e.g. "httpjson_webserver_stats".
  ##
  ## Deprecated (1.3.0): Use name_override, name_suffix, name_prefix instead.
  name = "webserver_stats"

  ## URL of each server in the service's cluster
  servers = [
    "http://localhost:9999/stats/",
    "http://localhost:9998/stats/",
  ]
  ## Set response_timeout (default 5 seconds)
  response_timeout = "5s"

  ## HTTP method to use: GET or POST (case-sensitive)
  method = "GET"

  ## Tags to extract from top-level of JSON server response.
  # tag_keys = [
  #   "my_tag_1",
  #   "my_tag_2"
  # ]

  ## Optional SSL Config
  # ssl_ca = "/etc/telegraf/ca.pem"
  # ssl_cert = "/etc/telegraf/cert.pem"
  # ssl_key = "/etc/telegraf/key.pem"
  ## Use SSL but skip chain & host verification
  # insecure_skip_verify = false

  ## HTTP Request Parameters (all values must be strings).  For "GET" requests, data
  ## will be included in the query.  For "POST" requests, data will be included
  ## in the request body as "x-www-form-urlencoded".
  # [inputs.httpjson.parameters]
  #   event_type = "cpu_spike"
  #   threshold = "0.75"

  ## HTTP Request Headers (all values must be strings).
  # [inputs.httpjson.headers]
  #   X-Auth-Token = "my-xauth-token"
  #   apiVersion = "v1"

Measurements & Fields:

  • httpjson
    • response_time (float): Response time in seconds

Additional fields are dependant on the response of the remote service being polled.

Tags:

  • All measurements have the following tags:
    • server: HTTP origin as defined in configuration as servers.

Any top level keys listed under tag_keys in the configuration are added as tags. Top level keys are defined as keys in the root level of the object in a single object response, or in the root level of each object within an array of objects.

Examples Output:

This plugin understands responses containing a single JSON object, or a JSON Array of Objects.

Object Output:

Given the following response body:

{
    "a": 0.5,
    "b": {
        "c": "some text",
        "d": 0.1,
        "e": 5
    },
    "service": "service01"
}

The following metric is produced:

httpjson,server=http://localhost:9999/stats/ b_d=0.1,a=0.5,b_e=5,response_time=0.001

Note that only numerical values are extracted and the type is float.

If tag_keys is included in the configuration:

[[inputs.httpjson]]
  tag_keys = ["service"]

Then the service tag will also be added:

httpjson,server=http://localhost:9999/stats/,service=service01 b_d=0.1,a=0.5,b_e=5,response_time=0.001

Array Output:

If the service returns an array of objects, one metric is be created for each object:

[
    {
        "service": "service01",
        "a": 0.5,
        "b": {
            "c": "some text",
            "d": 0.1,
            "e": 5
        }
    },
    {
        "service": "service02",
        "a": 0.6,
        "b": {
            "c": "some text",
            "d": 0.2,
            "e": 6
        }
    }
]

httpjson,server=http://localhost:9999/stats/,service=service01 a=0.5,b_d=0.1,b_e=5,response_time=0.003 httpjson,server=http://localhost:9999/stats/,service=service02 a=0.6,b_d=0.2,b_e=6,response_time=0.003