[BUG] Prometheus output is not parsable by Prometheus common libraries

[jpenning-tibco]

Describe the bug Pulsar/KoP 2.9.1 generates multiple identical TYPE definitions, which causes the following error:

error parsing MF: text format parsing error in line 780: second TYPE line for metric name "kop_server_REQUEST_LATENCY", or TYPE reported after samples

To Reproduce

• You need to generate some Kafka traffic.
• Build and run the following Go test program: promreader.zip

Expected behavior The attached program should iterate and print all the Pulsar key/values, including those generated by KoP.

[BewareMyPower]

Which KoP version and Pulsar version did you use?

[jpenning-tibco]

Pulsar/Kop 2.9.1