Prometheus Drop and Keep are exclusive. So they work against all metrics
that match, or all metrics that don't.
What we're doing is taking a metrics like this:
mysql_info_schema_table_size{instance_name="primary-00"}
mysql_info_schema_table_size{instance_name="secondary-00"}
Phase 1 does this:
mysql_info_schema_table_size{instance_name="primary-00",__tmp_keep="true"}
mysql_info_schema_table_size{instance_name="secondary-00"}
Second phase drops where `__tmp_keep` is ""
So all you are left with is
mysql_info_schema_table_size{instance_name="primary-00"}
(Brian's version does the labeldrop automatically)
On Tue, Jun 13, 2023 at 4:33 PM pandrian <[email protected]>
wrote:
> Oh wow! thanks a bunch guys that works!
>
> Any chance you could explain step by step how does this work? i lost you
> on the drop action, if keep label is the set of instance and table then how
> does this work? im confused :D
>
>
> On Tuesday, June 13, 2023 at 2:38:15 PM UTC+1 Brian Candler wrote:
>
>> Or use "__tmp_keep" as the temporary label, then you shouldn't need the
>> labeldrop step.
>>
>> On Tuesday, 13 June 2023 at 14:01:16 UTC+1 Ben Kochie wrote:
>>
>>> Negative lookahead regexp syntax is not supported.
>>>
>>> https://github.com/google/re2/wiki/Syntax
>>>
>>> What you can do is use use a temporary relabel to mark metrics as "keep".
>>>
>>> Something like this:
>>>
>>> metric_relabel_configs:
>>> # Drop the specific metric from all instances except primary
>>> - source_labels: [instance_name, __name__]
>>> regex: 'primary-00;mysql_info_schema_table_size'
>>> replacement: 'true'
>>> target_label: keep
>>> - source_labels: [__name__,keep]
>>> regex: 'mysql_info_schema_table_size;'
>>> action: drop
>>> - regex: keep
>>> action: labeldrop
>>>
>>> On Tue, Jun 13, 2023 at 2:51 PM pandrian <[email protected]>
>>> wrote:
>>>
>>>> Hey guys im trying to basically drop a specific metric from a job that
>>>> has a couple of instances but keep it only for one instance is this
>>>> possible?
>>>>
>>>> i tried something like this but its not working.
>>>>
>>>> metric_relabel_configs:
>>>> # Drop the specific metric from all instances except primary
>>>> - source_labels: [instance_name, __name__]
>>>> regex: '!^primary-00,mysql_info_schema_table_size'
>>>> action: drop
>>>>
>>>>
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>>>> .
>>>>
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