invalid key on valid prometheus keep_firing_for property

[tl-eirik-albrigtsen]

The keep_firing_for field was added to prometheus alerts in prometheus/prometheus#11827 which landed in 2.42.0 and is also supported in prometheus-operator in prometheusrules.

when running pint lint prod/ (say) on a folder with prometheusrules containing the property a yaml/parse error triggers on all alerts with this key:

prod/thanos-alerts.yaml:294 Fatal: invalid key(s) found: keep_firing_for (yaml/parse)
 294 |       keep_firing_for: 5m

pint version at 0.45.0 (revision: Homebrew)

am running a relaxed "yaml/parse" setup with .pint.hcl containing:

parser {
  relaxed = [ "(.*)", "yaml/parse" ]
}

to support prometheusrule usage but this does not seem to suppress the error. not sure if there are other ways to ignore this error explicitly.

at any rate it would be nice to have this property supported!

[prymitive]

Fixed in #713 713