Update the Kafka Exporter to 1.8.0

[scholzj]

Type of change

• Task

Description

This PR updates the Kafka Exporter to a new version 1.8.0 that brings some bugfixes but also addresses some CVEs.

I also had to update the Grafana dashboard as the kafka_exporter_build_info does not exist anymore. I now use the kafka_broker_info metric instead that is present even when no consumers are running and is unique for the Kafka Exporter. (I also considered the go_build_info metric, but that will likely be in many Go-based pods)

Checklist

• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally

[scholzj]

/azp run regression

[azure-pipelines]

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