Duplicated HELP and TYPE lines in prometheus exporter

[fabrepe]

Bug description

I am trying to scrape prometheus output using InfluxDB's Telegraf client, which is supported in Telegraf.

It fails with the following errors

[inputs.prometheus] Error in plugin: error reading metrics for http://localhost:9090/metrics: reading text format failed: text format parsing error in line 4: second HELP line for metric name "scaph_process_power_consumption_microwatts"

In fact metrics sent by prometheus exporter contains several HELP and TYPE definition for the same metric.

# HELP scaph_process_power_consumption_microwatts Power consumption due to the process, measured on at the topology level, in microwatts
# TYPE scaph_process_power_consumption_microwatts gauge
scaph_process_power_consumption_microwatts{cmdline="",pid="305600",exe="kworker/2:2-mm_percpu_wq"} 0
# HELP scaph_process_power_consumption_microwatts Power consumption due to the process, measured on at the topology level, in microwatts
# TYPE scaph_process_power_consumption_microwatts gauge

Expected behavior

prometheus TYPE and HELP definition for a given metric should only be defined once (prometheus/common#265)

Environment

• Linux distribution version : Debian 11
• Kernel version : 5.10.0-8-amd64

[bpetit]

Hi, thanks a lot for the notice !

Could you give a try to this branch ? #192

[dmazhar-cogniance]

Hey @bpetit , I had the same problem for the latest release. Tried to build the latest dev branch and it resolved the problem.

[bpetit]

Hi @dmazhar-cogniance !

Thanks a lot for the feedback ! Closing until contrary feedback