It worked. Thanks a lot.
On Tuesday, May 26, 2020 at 5:22:14 PM UTC-4, Brian Candler wrote:
>
> {label=""} means 'the label does not exist', and {label!=""} means 'the
> label exists with any value'.
>
> Labels cannot exist with empty string value.
>
> Try it in PromQL expression browser and you'll see. For example:
>
> up
>
> up{flurblywombat=""}
>
> - they will give the same result.
>
> Note: it's the metric name plus bag of labels which is the unique identity
> of the timeseries. When labels change or "go missing", you have created a
> completely different timeseries.
>
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