How to add fallback_scrape_protocol in Prometheus Operator?

[dbursztynowski]

I'm running kube-prometheus with Prometheus v3.1.0 (image: quay.io/prometheus/prometheus:v3.1.0) and obtain "non-compliant scrape target sending blank Content-Type and no fallback_scrape_protocol specified for target" notification. Checking Prometheus CRD, I find that fallback_scrape_protocol is missing in the definition so there's no way to set it up via the CR. How to set this property not using the CR?

[slashpai]

one of the option is to use scrapeclass where you can specify default fallback scrape protocol for monitoring resource objects

more on scrape class: https://prometheus-operator.dev/docs/developer/scrapeclass

[dbursztynowski]

Looks promising, Thanks a lot for the hint.