Append fail, when Prometheus server is trying collect metric

[zhenik]

I think this issue appear due to sanitising.

Link to source

[zhenik]

Tool to check prometheus formatting [this blog post] (https://www.robustperception.io/invalid-is-not-a-valid-start-token-and-other-scrape-errors)

[zhenik]

p1mac078:prometheus-2.12.0.darwin-amd64 k01136$ curl http://localhost:8080/metrics | ./promtool check metrics
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 27537  100 27537    0     0  1372k      0 --:--:-- --:--:-- --:--:-- 1415k
error while linting: text format parsing error in line 206: second HELP line for metric name "producer_node_metrics_request_size_max"

KafkaJmxReporter exports several metrics with tagKey node-id with single dash - and double dash--. These metrics registered twice in KafkaJmxReporter , and also twice when exporting. Current solution is to ignore metrics with double dash --.

[zhenik]

#13 Fix in PR