A collection of metrics that are the same except for their labels. e.g. "Number of HTTP responses"
val v_labels : label_names:string list -> ?registry:CollectorRegistry.t -> help:string -> ?namespace:string -> ?subsystem:string -> string -> family
v_labels ~label_names ~help ~namespace ~subsystem name
is a family of metrics with full name namespace_subsystem_name
and documentation string help
. Each metric in the family will provide a value for each of the labels. The new family is registered with registry
(default: CollectorRegistry.default
).
labels family label_values
is the metric in family
with these values for the labels. The order of the values must be the same as the order of the label_names
passed to v_labels
; you may wish to write a wrapper function with labelled arguments to avoid mistakes. If this is called multiple times with the same set of values, the existing metric will be returned.
val v_label : label_name:string -> ?registry:CollectorRegistry.t -> help:string -> ?namespace:string -> ?subsystem:string -> string -> string -> t
v_label
is a convenience wrapper around v_labels
for the case where there is a single label. The result is a function from the single label's value to the metric.
val v : ?registry:CollectorRegistry.t -> help:string -> ?namespace:string -> ?subsystem:string -> string -> t
v
is a convenience wrapper around v_labels
for the case where there are no labels.