[BUG] long metrics name are not working, and no error message is shown

[MansuyDavid]

Description

If i use a long metric name for example : sqlid_without_profile_on_WCR_PTA_MULTI_DEEP_BIN_V
i never get the metric oracledb_test_sqlid_without_profile_on_WCR_PTA_MULTI_DEEP_BIN_V{sql_id="azerty"} 1
I think the error is caused by the long name of the metrics but I'm not sure.

Step to reproduce

use this in custom-metrics.yaml (it will probably do the same in default-metrics.yml) :

  - context: test
    databases:
    - oracle_PROD_DMAM
    ignorezeroresult: true
    labels:
    - sql_id
    metricsdesc:
      sqlid_without_profile_on_WCR_PTA_MULTI_DEEP_BIN_V: the value of test
    request: "select 'azerty' as sql_id, 1 as sqlid_without_profile_on_WCR_PTA_MULTI_DEEP_BIN_V from dual"

Expected Behavior

I was expecting at least some errors in the logs that says why this metric is not correctly handled.

Environment

• OS: docker
• Exporter version: 2.1.0

[anders-swanson]

Thanks for reporting this. We'll determine any metric naming limitations, relax any that can be, and document others. I couldn't find any specific documentation that limits the length of a metric name, so some investigation is required.