Hi,

With alerting rules the Prometheus API (and templating language) has access 
to the "Value" of an alert which appears to be the first metric specified 
without the comparator.

I was wondering if this is something that is easily accessible in the 
Prometheus Go packages such that I could give it the expression string and 
it would strip out the comparison part and return just the metric query.

For example passing in:
> sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 
50
would return
> sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024

Thanks,
Callum

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