Add function to support replacing label values like regexp.ReplaceAllString

[Wing924]

have a metrics like resp_time_sum{vip="www_example_com"}.
I want to replace _ with . in vip label: resp_time_sum{vip="www.example.com"}

Currently, label_replace function can't do this because we can't know how many _ the value contains.
I asked this question in prometheus-users, but the suggest rename label in exporters.

Because we can't always change the exporters, I think add a new function label_gsub may be useful.

# dst_label = regex.ReplaceAllString(src_label, replacement)
label_gsub(v instant-vector, dst_label string, replacement string, src_label string, regex string)

gsub come from ruby's gsub

[brian-brazil]

This sort of thing is best fixed in your source data. Regexes in PromQL are anchored, which are not compatible with global replacements.

[lock]

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