[prometheus-users] Re: SNMP Exporter - regex_extracts - not extracting value or not working as expected

['Brian Candler' via Prometheus Users]

On Friday, 5 September 2025 at 21:58:15 UTC+1 Alexander Wilke wrote:


I get this in my generated snmp.yml:
...
          regex: ^(?:([0-9.]+))$


You can see that this resulting regex is anchored, so it will not match a 
value with a literal "%" at the end. So first thing to fix in your 
generator source is:

            - regex: '([0-9.]+)%'
or
            - regex: '([0-9.]+).*'

 Also, remove "type: Float", or set "type: DisplayString" - because the 
actual SNMP type is DisplayString, the regex needs to match against a 
string, and the final value is implicitly parsed as a float.

You can find working examples in the sample generator.yml:

    overrides:
      ...
      pduMainLoadAmp:
        regex_extracts:
          '':
            - regex: '(.*)(.)'
              value: '$1.$2'


    overrides:
      ddmStatusBiasCurrent:
        type: DisplayString
        regex_extracts:
          '':
            - regex: '^(\d+\.\d+).*'
              value: '$1'

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