# Functions
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.
# Constants
DefaultGroup is the identifier for the default group.
# Structs
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.
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The timer type is used to store a duration.
# Interfaces
The Metric type defines a Name.