promgrep

Intro

promgrep is a small utility to search for the locations in Go code where Prometheus metrics are declared.

Usage

Run promgrep in the root directory of your Go project (where your go.mod file is).

Without args

promgrep

promgrep will list the locations of all the metric declarations together with the metric names and help strings.

With one argument: name of a metric

promgrep some:metric:name

promgrep will search for the location of that particular metric declaration.

Matching

promgrep is doing static analysis and therefore can only deduce values of arguments to metric construction function calls if those arguments are basic literals.

For cases where arguments are not derived it uses partial matching and assigns a relative score to each partial match (in the range [0..100] with 0 meaning no match and 100 meaning exact match).

The matching function also accepts partial metric names to search for, so you can run

promgrep some:partial:metric:name

and it will list all metric declarations that contain this partial name.

Output

The code locations in the promgrep output are of the form

relative_path_to_file:line_number

and should be clickable in Emacs buffers, Goland terminals and other tools that parse format and make it navigable. Clicking on an output line should get you to the place in code where the declaration is.