Manages the collection of a number of metrics. More...

Inheritance diagram for prometheus::Registry:

Collaboration diagram for prometheus::Registry:

Public Types
enum	InsertBehavior { InsertBehavior::Merge, InsertBehavior::Throw }
	How to deal with repeatedly added family names for a type. More...

Public Member Functions
	Registry (InsertBehavior insert_behavior=InsertBehavior::Merge)
	name Create a new registry. More...

	Registry (const Registry &)=delete
	Deleted copy constructor.

Registry &	operator= (const Registry &)=delete
	Deleted copy assignment.

	Registry (Registry &&)=delete
	Deleted move constructor.

Registry &	operator= (Registry &&)=delete
	Deleted move assignment.

	~Registry () override
	name Destroys a registry.

std::vector< MetricFamily >	Collect () const override
	Returns a list of metrics and their samples. More...

template<typename T >
bool	Remove (const Family< T > &family)
	Removes a metrics family from the registry. More...

template<>
std::vector< std::unique_ptr< Family< Counter > > > &	GetFamilies ()

Friends
template<typename T >
class	detail::Builder

Detailed Description

Manages the collection of a number of metrics.

The Registry is responsible to expose data to a class/method/function "bridge", which returns the metrics in a format Prometheus supports.

The key class is the Collectable. This has a method - called Collect() - that returns zero or more metrics and their samples. The metrics are represented by the class Family<>, which implements the Collectable interface. A new metric is registered with BuildCounter(), BuildGauge(), BuildHistogram(), BuildInfo() or BuildSummary().

The class is thread-safe. No concurrent call to any API of this type causes a data race.

Member Enumeration Documentation

◆ InsertBehavior

enum prometheus::Registry::InsertBehavior

strong

How to deal with repeatedly added family names for a type.

Adding a family with the same name but different types is always an error and will lead to an exception.

Enumerator
Merge	If a family with the same name and labels already exists return the existing one. If no family with that name exists create it. Otherwise throw.
Throw	Throws if a family with the same name already exists.

Constructor & Destructor Documentation

◆ Registry()

prometheus::Registry::Registry ( InsertBehavior insert_behavior = InsertBehavior::Merge )

explicit

name Create a new registry.

Parameters

insert_behavior How to handle families with the same name.

Member Function Documentation

◆ Collect()

std::vector< MetricFamily > prometheus::Registry::Collect ( ) const

overridevirtual

Returns a list of metrics and their samples.

Every time the Registry is scraped it calls each of the metrics Collect function.

Returns: Zero or more metrics and their samples.

Implements prometheus::Collectable.

◆ Remove()

template<typename T >

template bool PROMETHEUS_CPP_CORE_EXPORT prometheus::Registry::Remove ( const Family< T > & family )

Removes a metrics family from the registry.

Please note that this operation invalidates the previously returned reference to the Family and all of their added metric objects.

Template Parameters

T	One of the metric types Counter, Gauge, Histogram or Summary.

Parameters

family The family to remove

Returns: True if the family was found and removed.

Public Types

Public Member Functions

Friends