[bug] Expected value after metric, got "#" ("INVALID") while parsing: "Resilience_polly_str#"

[sumjas]

Package

OpenTelemetry.Exporter.Prometheus.AspNetCore

Package Version

Package Name	Version
OpenTelemetry.Api	1.8.0
OpenTelemetry	1.8.0
TBD	TBD

Runtime Version

net6.0

Description

I'm facing a recurring issue in my deployed environments while scraping metrics using Prometheus. The error message reads:
"expected value after metric, got "#" ("INVALID") while parsing: "Resilience_polly_str#"

I'm using Polly library version 8 for resiliency, which internally uses OpenTelemetry for instrumentation. The metrics are being exported using a Prometheus exporter.

Steps to Reproduce

I'm using Polly library version 8 for resiliency, which internally uses OpenTelemetry for instrumentation.
The metrics are being exported using a Prometheus exporter.

Expected Result

It should export the metrics without any error.

Actual Result

"expected value after metric, got "#" ("INVALID") while parsing: "Resilience_polly_str#"

Additional Context

I am also going to raise a ticket with the Polly developer community. Please share the suggestions or workaround for this issue if you have any.

[sumjas]

The Prometheus version we are using - v.2.53.0

Here is the error we are seeing.

[Kielek]

I think that you missed one important part of the bug. It is Minimal, Reproducible Example. The same link is available in the bug-wizard.