Metric type 'untyped' not recognized in config on v0.7.0 despite documented support

[sergueik]

Summary

The official release of json_exporter v0.7.0 fails to recognize type: counter, type: gauge, or even type: untyped in the config YAML under metrics.

This worked in earlier versions, and documentation still describes these types as supported.

Reproduction Steps

Config (json_exporter_config.yml)

---
modules:
  stub:
    method: GET
    headers:
      Accept: application/json
    url: http://localhost:80/data
    params:
      ts: "{{.Labels.timestamp}}"
    response_format:
      type: json
    metrics:
    - name: stub_metric_value
      path: "{.metric_value}"
      type: counter

(any of counter gauge untyped fail.

Sample Data

dummy Endpoint returns:

{ "metric_value": 42, "timestamp": "1317532336" }

Run Command

json_exporter --config.file=json_exporter_config.yml

Probe Call

curl "http://localhost:7979/probe?target=http://localhost:80/data?ts=1317532336&module=stub"

error

err="Unknown metric type: 'counter', for metric: 'stub_metric_value'"

same with
gauge

untyped

uppercase variants (e.g., COUNTER)

Only omitting the type field avoids the error (defaulting to “untyped”).

Environment

json_exporter, version 0.7.0 (branch: HEAD, revision: 06fb506a4c5d242186f198b9c8bf072212f3a134)
  build user:       root@6a86be1e0b11
  build date:       20250205-13:57:47
  go version:       go1.18.10
  platform:         linux/amd64

type: counter should be accepted and produce a # TYPE ... counter metric in Prometheus format.

[Curtisjk]

I ran into the same issue, the config you need is valuetype:

    metrics:
    - name: stub_metric_value
      path: "{.metric_value}"
      valuetype: counter