GroupFromContext returns the Group associated with ctx or nil if no Group has been assigned.

MustRegisterCounter registers a new counter metric with the default registry using the provided descriptor.

MustRegisterGroup registers a new group using the specified name.

MustRegisterTimer registers a new timer metric with the default registry using the provided descriptor.

NewContextWithGroup returns a new context with the given Group added.

NewGroup returns a new measurement group from the default registry.

NewRegistry creates a new Registry with a single group identified by DefaultGroup.

WithGroup assigns the associated measurement to the group identified by gid originally returned from MustRegisterGroup.

DefaultGroup is the identifier for the default group.

The Counter type represents a numeric counter that is safe to use from concurrent goroutines.

The Group type represents an instance of a set of measurements that are used for instrumenting a specific request.

The timer type is used to store a duration.

The Metric type defines a Name.