help with "expected timestamp or new record, got \"MNAME\"

[Bob]

hello - I am struggling to resolve a problem with a new prometheus custom scrape target.  The following scrape configuration results in the following being logged:

Aug  7 12:39:19 prom1 prometheus: level=warn ts=2020-08-07T16:39:19.457Z caller=scrape.go:937 component="scrape manager" scrape_pool=lip target=https://auth.leagueapps.io:443/status msg="append failed" err="expected timestamp or new record, got \"MNAME\""

Prometheus version:  2.11.1

The scrape configuration:

- job_name: 'lip'

  scheme: 'https'

  scrape_interval: 12s

  static_configs:

   - targets: ['auth.leagueapps.io']

   metrics_path: '/status'

The promtool utility does not indicate a problem when doing:

wget https://auth.leagueapps.io/status | ./promtool check metrics

Thank you

[Matthias Rampke]

I think Prometheus is expecting the TYPE and HELP lines that are part of the exposition format. Which client library are you using?

/MR

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[Julien Pivotto]

You content type is not correct.

When you scrape it with OpenMetrics, the output is not Openmetrics
compatible.

You should advertise only support for the Prometheus text format.

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[Bob]

hi - I appreciate the responses.

A client library is not being used.  

The scrape target is returning a single metric.

How does one go about determining what exactly is incorrect about the content type?

And how would one explain the promtool test failing to indicate a problem?

thank you!

[Julien Pivotto]

On 08 Aug 05:57, Bob wrote:
> hi - I appreciate the responses.
> A client library is not being used.
> The scrape target is returning a single metric.
>
> How does one go about determining what exactly is incorrect about the
> content type?

OpenMetrics is different from Prometheus.

The content type should be:
text/plain; version=0.0.4

Prometheus DOES support OpenMetrics but your page is not OpenMetrics
Compatible.

Promtool checks for the Prometheus Exposition format, not OpenMetrics.

> To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/786ac0db-5978-4b17-be54-59d01d632959n%40googlegroups.com.


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Julien Pivotto
@roidelapluie