Negative numbers not extracted by promtail to a Gauge metric

[xkilian]

Describe the bug
Negative numbers cannot be extracted as Gauge metrics from logs in promtail.

To Reproduce
promtail config:

     #<13>Jan 28 14:25:52 vehicule=1 longitude=-10.1234 latitude=15.1234
      - match:
          selector: '{host="whatever"}'
          stages:
            - regex:
                expression: 'vehicule=(?P<vehicule>\d+) longitude=(?P<longitude>[-]?\d+\.\d+) latitude=(?P<latitude>\d+\.\d+)'
            - labels:
                vehicule:
            - metrics:
                longitude:
                  type: Gauge
                  description: "longitude GPS vehicule"
                  config:
                    match_all: true
                    action: set
                latitude:
                  type: Gauge
                  description: "latitude GPS vehicule"
                  config:
                    match_all: true
                    action: set

Expected behavior
Numbers like -10.1234 should be extracted from log lines.

Environment:

• linux Ubuntu 64bit
• loki 2.1

Screenshots, Promtail config, or terminal output
logfmt in logql has not problem with negative numbers, but promtail cannot cast the extracted number as a signed float to a Gauge after regex extraction.

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[xkilian]

This is still a problem for anyone dealing with extractions of GPS numbers, DBm, DB or any other signal type data.