json_exporter/README.md

json_exporter

A prometheus exporter which scrapes remote JSON by JSONPath. For checking the JSONPath configuration supported by this exporter please head over here.
Checkout the examples directory for sample exporter configuration, prometheus configuration and expected data format.

⚠️ The configuration syntax has changed in version 0.3.x. If you are migrating from 0.2.x, then please use the above mentioned JSONPath guide for correct configuration syntax.

Example Usage

$ cat examples/data.json
{
    "counter": 1234,
    "values": [
        {
            "id": "id-A",
            "count": 1,
            "some_boolean": true,
            "state": "ACTIVE"
        },
        {
            "id": "id-B",
            "count": 2,
            "some_boolean": true,
            "state": "INACTIVE"
        },
        {
            "id": "id-C",
            "count": 3,
            "some_boolean": false,
            "state": "ACTIVE"
        }
    ],
    "location": "mars"
}

$ cat examples/config.yml
---
metrics:
- name: example_global_value
  path: "{ .counter }"
  help: Example of a top-level global value scrape in the json
  labels:
    environment: beta # static label
    location: "planet-{.location}"          # dynamic label

- name: example_value
  type: object
  help: Example of sub-level value scrapes from a json
  path: '{.values[?(@.state == "ACTIVE")]}'
  labels:
    environment: beta # static label
    id: '{.id}'          # dynamic label
  values:
    active: 1      # static value
    count: '{.count}' # dynamic value
    boolean: '{.some_boolean}'

headers:
  X-Dummy: my-test-header

$ python -m SimpleHTTPServer 8000 &
Serving HTTP on 0.0.0.0 port 8000 ...

$ ./json_exporter --config.file examples/config.yml &

$ curl "http://localhost:7979/probe?target=http://localhost:8000/examples/data.json" | grep ^example
example_global_value{environment="beta",location="planet-mars"} 1234
example_value_active{environment="beta",id="id-A"} 1
example_value_active{environment="beta",id="id-C"} 1
example_value_boolean{environment="beta",id="id-A"} 1
example_value_boolean{environment="beta",id="id-C"} 0
example_value_count{environment="beta",id="id-A"} 1
example_value_count{environment="beta",id="id-C"} 3

# To test through prometheus:
$ docker run --rm -it -p 9090:9090 -v $PWD/examples/prometheus.yml:/etc/prometheus/prometheus.yml --network host prom/prometheus

Then head over to http://localhost:9090/graph?g0.range_input=1h&g0.expr=example_value_active&g0.tab=1 or http://localhost:9090/targets to check the scraped metrics or the targets.

Exposing metrics through HTTPS

TLS configuration supported by this exporter can be found at exporter-toolkit/web

Build

make build

Sending body content for HTTP POST

If body paramater is set in config, it will be sent by the exporter as the body content in the scrape request. The HTTP method will also be set as 'POST' in this case.

body:
  content: |
    My static information: {"time_diff": "1m25s", "anotherVar": "some value"}    

The body content can also be a Go Template. All the functions from the Sprig library can be used in the template. All the query parameters sent by prometheus in the scrape query to the exporter, are available as values while rendering the template.

Example using template functions:

body:
  content: |
    {"time_diff": "{{ duration `95` }}","anotherVar": "{{ randInt 12 30 }}"}    
  templatize: true

Example using template functions with values from the query parameters:

body:
  content: |
    {"time_diff": "{{ duration `95` }}","anotherVar": "{{ .myVal | first }}"}    
  templatize: true

Then curl "http://exporter:7979/probe?target=http://scrape_target:8080/test/data.json&myVal=something", would result in sending the following body as the HTTP POST payload to http://scrape_target:8080/test/data.json:

{"time_diff": "1m35s","anotherVar": "something"}.

Docker

docker run \
  -v $PWD/examples/config.yml:/config.yml \
  quay.io/prometheuscommunity/json-exporter \
  --config.file=/config.yml