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Added clarification. 

Signed-off-by: bwplotka <bwplotka@gmail.com>
This commit is contained in:
bwplotka 2023-05-03 09:39:47 +01:00
parent 2ea234eef0
commit b8fdd239b2
1 changed files with 3 additions and 3 deletions
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6
prometheus/promhttp/option.go
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@ -66,9 +66,9 @@ func WithExtraMethods(methods ...string) Option {
}) })
} }
// WithExemplarFromContext adds allows to put a hook to all counter and histogram metrics. // WithExemplarFromContext allows to inject function that will get exemplar from context that will be put to counter and histogram metrics.
// If the hook function returns non-nil labels, exemplars will be added for that request, otherwise metric // If the function returns nil labels or the metric does not support exemplars, no exemplar will be added (noop), but
// will get instrumented without exemplar. // metric will continue to observe/increment.
func WithExemplarFromContext(getExemplarFn func(requestCtx context.Context) prometheus.Labels) Option { func WithExemplarFromContext(getExemplarFn func(requestCtx context.Context) prometheus.Labels) Option {
return optionApplyFunc(func(o *options) { return optionApplyFunc(func(o *options) {
o.getExemplarFn = getExemplarFn o.getExemplarFn = getExemplarFn