prometheus-jsonpath-exporter

Converts json data from a http url into prometheus metrics using jsonpath

Config

exporter_port: 9158 # Port on which prometheus can call this exporter to get metrics
log_level: info
json_data_url: http://stubonweb.herokuapp.com/kong-cluster-status # Url to get json data used for fetching metric values
metric_name_prefix: kong_cluster # All metric names will be prefixed with this value
metrics:
- name: total_nodes # Final metric name will be kong_cluster_total_nodes
  description: Total number of nodes in kong cluster
  path: $.total
- name: alive_nodes # Final metric name will be kong_cluster_alive_nodes
  description: Number of live nodes in kong cluster
  path: count($.data[@.status is "alive"])

See the example below to understand how the json data and metrics will look for this config

Run

Using code (local)

# Ensure python 2.x and pip installed
pip install -r app/requirements.txt
python app/exporter.py example/config.yml

Using docker

docker run -p 9158:9158 -v $(pwd)/example/config.yml:/etc/prometheus-jsonpath-exporter/config.yml sunbird/prometheus-jsonpath-exporter /etc/prometheus-jsonpath-exporter/config.yml

JsonPath Syntax

This exporter uses objectpath python library. The syntax is documented here

Example

For the above config, if the configured json_data_url returns

{
  "data": [
    {
      "address": "x.x.x.15:7946",
      "status": "failed"
    },
    {
      "address": "x.x.x.19:7946",
      "status": "alive"
    },
    {
      "address": "x.x.x.12:7946",
      "status": "alive"
    }
  ],
  "total": 3
}

Metrics will available in http://localhost:9158

$ curl -s localhost:9158 | grep ^kong
kong_cluster_total_nodes 3.0
kong_cluster_alive_nodes 2.0