metrics.h File Reference

Metrics feature. More...

Data Structures
struct	diffusion_metrics_put_session_metric_collector_params_s
	Structure supplied when issuing a diffusion_metrics_put_session_metric_collector call. More...
struct	diffusion_metrics_put_topic_metric_collector_params_s
	Structure supplied when issuing a diffusion_metrics_put_topic_metric_collector call. More...
struct	diffusion_metrics_remove_session_metric_collector_params_s
	Structure supplied when issuing a diffusion_metrics_remove_session_metric_collector call. More...
struct	diffusion_metrics_remove_topic_metric_collector_params_s
	Structure supplied when issuing a diffusion_metrics_remove_topic_metric_collector call. More...
struct	diffusion_metrics_list_session_metric_collectors_params_s
	Structure supplied when issuing a diffusion_metrics_list_session_metric_collectors call. More...
struct	diffusion_metrics_list_topic_metric_collectors_params_s
	Structure supplied when issuing a diffusion_metrics_list_topic_metric_collectors call. More...

Typedefs
typedef struct DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T	DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T
	Opaque Session Metric Collector Builder struct.
typedef struct DIFFUSION_SESSION_METRIC_COLLECTOR_T	DIFFUSION_SESSION_METRIC_COLLECTOR_T
	Opaque Session Metric Collector struct.
typedef struct DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T	DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T
	Opaque Topic Metric Collector Builder struct.
typedef struct DIFFUSION_TOPIC_METRIC_COLLECTOR_T	DIFFUSION_TOPIC_METRIC_COLLECTOR_T
	Opaque Topic Metric Collector struct.
typedef int(*	session_metric_collector_put_cb )(void *context)
	callback when a session metric collector has been set on the server. More...
typedef int(*	session_metric_collector_remove_cb )(void *context)
	callback when a session metric collector has been removed from the server. More...
typedef int(*	session_metric_collector_list_cb )(const LIST_T *session_metric_collectors, void *context)
	callback when the list of session metric collectors has been retrieved from the server. More...
typedef int(*	topic_metric_collector_put_cb )(void *context)
	callback when a topic metric collector has been set on the server. More...
typedef int(*	topic_metric_collector_remove_cb )(void *context)
	callback when a topic metric collector has been removed from the server. More...
typedef int(*	topic_metric_collector_list_cb )(const LIST_T *topic_metric_collectors, void *context)
	callback when the list of topic metric collectors has been retrieved from the server. More...
typedef struct diffusion_metrics_put_session_metric_collector_params_s	DIFFUSION_METRICS_PUT_SESSION_METRIC_COLLECTOR_PARAMS_T
	Structure supplied when issuing a diffusion_metrics_put_session_metric_collector call.
typedef struct diffusion_metrics_put_topic_metric_collector_params_s	DIFFUSION_METRICS_PUT_TOPIC_METRIC_COLLECTOR_PARAMS_T
	Structure supplied when issuing a diffusion_metrics_put_topic_metric_collector call.
typedef struct diffusion_metrics_remove_session_metric_collector_params_s	DIFFUSION_METRICS_REMOVE_SESSION_METRIC_COLLECTOR_PARAMS_T
	Structure supplied when issuing a diffusion_metrics_remove_session_metric_collector call.
typedef struct diffusion_metrics_remove_topic_metric_collector_params_s	DIFFUSION_METRICS_REMOVE_TOPIC_METRIC_COLLECTOR_PARAMS_T
	Structure supplied when issuing a diffusion_metrics_remove_topic_metric_collector call.
typedef struct diffusion_metrics_list_session_metric_collectors_params_s	DIFFUSION_METRICS_LIST_SESSION_METRIC_COLLECTORS_PARAMS_T
	Structure supplied when issuing a diffusion_metrics_list_session_metric_collectors call.
typedef struct diffusion_metrics_list_topic_metric_collectors_params_s	DIFFUSION_METRICS_LIST_TOPIC_METRIC_COLLECTORS_PARAMS_T
	Structure supplied when issuing a diffusion_metrics_list_topic_metric_collectors call.

Functions
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_init ()
	Initialize a new session metric collector builder. More...
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_reset (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder)
	Reset the session metric collector builder's internal values. More...
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_export_to_prometheus (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder, bool export)
	Specifies whether the metric collector should export metrics to Prometheus or not. More...
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_maximum_groups (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder, int limit)
	Set the maximum number of groups maintained by the metric collector. More...
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_group_by_property (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder, char *property_name)
	Adds the name of a session property to group by to the list known to this builder. More...
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_group_by_properties (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder, LIST_T *property_names)
	Specifies a list of session property names to group by, replacing any current list known to this builder. More...
DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	diffusion_session_metric_collector_builder_remove_metrics_with_no_matches (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder, bool remove)
	Specifies whether the metric collector should remove any metrics that have no matches. More...
void	diffusion_session_metric_collector_builder_free (DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *builder)
	Free a session metric collector builder. More...
void	diffusion_session_metric_collector_free (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector)
	Free a session metric collector. More...
bool	diffusion_session_metric_collector_get_session_filter (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector, char **session_filter)
	Returns the session filter of the session metric collector. More...
bool	diffusion_session_metric_collector_get_name (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector, char **name)
	Returns the name of the session metric collector. More...
bool	diffusion_session_metric_collector_removes_metrics_with_no_matches (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector, bool *removes)
	Indicates whether metrics with no matches should be removed. More...
bool	diffusion_session_metric_collector_exports_to_prometheus (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector, bool *exports)
	Indicates whether the metric collector exports to Prometheus. More...
bool	diffusion_session_metric_collector_maximum_groups (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector, int *maximum_groups)
	Limit the number of groups maintained by this metric collector. More...
bool	diffusion_session_metric_collector_get_group_by_properties (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector, LIST_T **group_by)
	Returns the list of properties to group by. More...
bool	diffusion_session_metric_collector_compare (DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector_1, DIFFUSION_SESSION_METRIC_COLLECTOR_T *collector_2)
	Compares two session metric collectors. More...
DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	diffusion_topic_metric_collector_builder_init ()
	Initialize a new topic metric collector builder. More...
DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	diffusion_topic_metric_collector_builder_reset (DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder)
	Reset the topic metric collector builder's internal values. More...
DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	diffusion_topic_metric_collector_builder_export_to_prometheus (DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder, bool export)
	Specifies whether the metric collector should export metrics to Prometheus or not. More...
DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	diffusion_topic_metric_collector_builder_maximum_groups (DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder, int limit)
	Set the maximum number of groups maintained by the metric collector. More...
DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	diffusion_topic_metric_collector_builder_group_by_topic_type (DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder, bool group_by_topic_type)
	Specifies whether the metric collector should group by topic type. More...
DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	diffusion_topic_metric_collector_builder_group_by_path_prefix_parts (DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder, int parts)
	Specifies the number of leading parts of the topic path the metric collector should use to group results. More...
	DEPRECATED (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *diffusion_topic_metric_collector_builder_create_collector(DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder, char *name, char *topic_selector)) DIFFUSION_TOPIC_METRIC_COLLECTOR_T *diffusion_topic_metric_collector_builder_create(DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder
	Create a new topic metric collector using the values currently known by the builder. More...
void	diffusion_topic_metric_collector_builder_free (DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder)
	Free a topic metric collector builder. More...
void	diffusion_topic_metric_collector_free (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector)
	Free a topic metric collector. More...
bool	diffusion_topic_metric_collector_get_topic_selector (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector, char **topic_selector)
	Returns the topic selector of the topic metric collector. More...
bool	diffusion_topic_metric_collector_get_name (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector, char **name)
	Returns the name of the topic metric collector. More...
bool	diffusion_topic_metric_collector_groups_by_topic_type (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector, bool *groups_by_topic_type)
	Specifies whether the metric collector should group by topic type. More...
bool	diffusion_topic_metric_collector_group_by_path_prefix_parts (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector, int *group_by_path_prefix_parts)
	Specifies the number of leading parts of the topic path to group by, or 0, if the collector does not group by path prefix. More...
bool	diffusion_topic_metric_collector_exports_to_prometheus (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector, bool *exports)
	Indicates whether the metric collector exports to Prometheus. More...
bool	diffusion_topic_metric_collector_maximum_groups (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector, int *maximum_groups)
	Limit the number of groups maintained by this metric collector. More...
bool	diffusion_topic_metric_collector_compare (DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector_1, DIFFUSION_TOPIC_METRIC_COLLECTOR_T *collector_2)
	Compares two topic metric collectors. More...
bool	diffusion_metrics_put_session_metric_collector (SESSION_T *session, const DIFFUSION_METRICS_PUT_SESSION_METRIC_COLLECTOR_PARAMS_T params, DIFFUSION_API_ERROR *api_error)
	Add a session metric collector, replacing any with the same name. More...
bool	diffusion_metrics_list_session_metric_collectors (SESSION_T *session, const DIFFUSION_METRICS_LIST_SESSION_METRIC_COLLECTORS_PARAMS_T params, DIFFUSION_API_ERROR *api_error)
	Retrieves the current session metric collectors. More...
bool	diffusion_metrics_remove_session_metric_collector (SESSION_T *session, const DIFFUSION_METRICS_REMOVE_SESSION_METRIC_COLLECTOR_PARAMS_T params, DIFFUSION_API_ERROR *api_error)
	Removes any session metric collector with the given name, if it exists. More...
bool	diffusion_metrics_put_topic_metric_collector (SESSION_T *session, const DIFFUSION_METRICS_PUT_TOPIC_METRIC_COLLECTOR_PARAMS_T params, DIFFUSION_API_ERROR *api_error)
	Add a topic metric collector, replacing any with the same name. More...
bool	diffusion_metrics_list_topic_metric_collectors (SESSION_T *session, const DIFFUSION_METRICS_LIST_TOPIC_METRIC_COLLECTORS_PARAMS_T params, DIFFUSION_API_ERROR *api_error)
	Retrieves the current topic metric collectors. More...
bool	diffusion_metrics_remove_topic_metric_collector (SESSION_T *session, const DIFFUSION_METRICS_REMOVE_TOPIC_METRIC_COLLECTOR_PARAMS_T params, DIFFUSION_API_ERROR *api_error)
	Removes any topic metric collector with the given name, if it exists. More...

Detailed Description

Metrics feature.

This feature allows a client to configure metric collectors.

Diffusion servers provide metrics which are made available in several ways:-

• Java Management Extensions (JMX) MBeans.
• Through the Diffusion Management Console.
• As endpoints for Prometheus.

Metric collectors allow custom aggregation of metrics that are relevant to your application. There are no default metric collectors, only the ones that you create.

There are two types of metric collector: Session Metric Collectors and Topic Metric Collectors.

For full details regarding the configuration and operation of metric collectors see the user manual.

Session Metric Collectors

These can be configured to record metric data for a subset of all sessions, specified with a session filter.

The set of metrics recorded by each session metric collector is the same as those recorded for the whole server. For full details of session metrics, see the table in the user manual.

If the session filters of two different session metric collectors select the same session, both will record metrics for that session. It is only valid to add the metrics of different session metric collectors if their session filters select distinct sets of sessions.

You can optionally group the sessions within a collector by session properties.

Topic Metric Collectors

These can be configured to record metric data for a subset of all topics, specified with a topic selector.

You can optionally group the topics within a collector by topic type.

The set of metrics recorded by each topic metric collector is the same as those recorded for the whole server. For full details of topic metrics, see the table in the user manual.

If the topic selectors of two different topic metric collectors select the same topic, both will record metrics for that topic. It is only valid to add the metrics of different topic metric collectors if their topic selectors select distinct sets of topics.

Access control

The following access control restrictions are applied:

• To put or remove a session metric collector, a session needs the CONTROL_SERVER global permission.
• To put or remove a topic metric collector, a session needs the CONTROL_SERVER global permission.
• To list session metric collectors or topic metric collectors, a session needs the VIEW_SERVER global permission.

Since

6.7

Typedef Documentation

typedef int(* session_metric_collector_list_cb)(const LIST_T *session_metric_collectors, void *context)

callback when the list of session metric collectors has been retrieved from the server.

Parameters

context

User supplied context.

Returns

HANDLER_SUCCESS or HANDLER_FAILURE.

typedef int(* session_metric_collector_put_cb)(void *context)

callback when a session metric collector has been set on the server.

Parameters

context

User supplied context.

Returns

HANDLER_SUCCESS or HANDLER_FAILURE.

typedef int(* session_metric_collector_remove_cb)(void *context)

callback when a session metric collector has been removed from the server.

Parameters

context

User supplied context.

Returns

HANDLER_SUCCESS or HANDLER_FAILURE.

typedef int(* topic_metric_collector_list_cb)(const LIST_T *topic_metric_collectors, void *context)

callback when the list of topic metric collectors has been retrieved from the server.

Parameters

context

User supplied context.

Returns

HANDLER_SUCCESS or HANDLER_FAILURE.

typedef int(* topic_metric_collector_put_cb)(void *context)

callback when a topic metric collector has been set on the server.

Parameters

context

User supplied context.

Returns

HANDLER_SUCCESS or HANDLER_FAILURE.

typedef int(* topic_metric_collector_remove_cb)(void *context)

callback when a topic metric collector has been removed from the server.

Parameters

context

User supplied context.

Returns

HANDLER_SUCCESS or HANDLER_FAILURE.

Function Documentation

DEPRECATED

(

DIFFUSION_TOPIC_METRIC_COLLECTOR_T *

diffusion_topic_metric_collector_builder_create_collectorDIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *builder,char *name,char *topic_selector

)

Create a new topic metric collector using the values currently known by the builder.

Parameters

builder	the topic metric collector builder
name	the name of the topic metric collector
topic_selector	the selector pattern that specifies the topics for which metrics are to be collected

Returns

a new topic metric collector if the operation was successful, NULL otherwise.

Since

6.7

Deprecated:

since 6.8 and will be removed in a future release use diffusion_topic_metric_collector_builder_create instead

Create a new topic metric collector using the values currently known by the builder.

Parameters

builder	the topic metric collector builder
name	the name of the topic metric collector
topic_selector	the selector pattern that specifies the topics for which metrics are to be collected
api_error	populated on API error. Can be NULL.

Returns

a new topic metric collector if the operation was successful, NULL otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

Since

6.7

bool diffusion_metrics_list_session_metric_collectors	(	SESSION_T *	session,
		const DIFFUSION_METRICS_LIST_SESSION_METRIC_COLLECTORS_PARAMS_T	params,
		DIFFUSION_API_ERROR *	api_error
	)

Retrieves the current session metric collectors.

Parameters

session	The current session. If NULL, this function returns immediately.
params	Parameter structure describing the callbacks to be invoked.
api_error	Populated on API error. Can be NULL.

Returns

true if the operation was successful. False, otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

bool diffusion_metrics_list_topic_metric_collectors	(	SESSION_T *	session,
		const DIFFUSION_METRICS_LIST_TOPIC_METRIC_COLLECTORS_PARAMS_T	params,
		DIFFUSION_API_ERROR *	api_error
	)

Retrieves the current topic metric collectors.

Parameters

session	The current session. If NULL, this function returns immediately.
params	Parameter structure describing the callbacks to be invoked.
api_error	Populated on API error. Can be NULL.

Returns

true if the operation was successful. False, otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

bool diffusion_metrics_put_session_metric_collector	(	SESSION_T *	session,
		const DIFFUSION_METRICS_PUT_SESSION_METRIC_COLLECTOR_PARAMS_T	params,
		DIFFUSION_API_ERROR *	api_error
	)

Add a session metric collector, replacing any with the same name.

Parameters

session	The current session. If NULL, this function returns immediately.
params	Parameter structure describing the session metric collector and the callbacks to be invoked.
api_error	Populated on API error. Can be NULL.

Returns

true if the operation was successful. False, otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

bool diffusion_metrics_put_topic_metric_collector	(	SESSION_T *	session,
		const DIFFUSION_METRICS_PUT_TOPIC_METRIC_COLLECTOR_PARAMS_T	params,
		DIFFUSION_API_ERROR *	api_error
	)

Add a topic metric collector, replacing any with the same name.

Parameters

session	The current session. If NULL, this function returns immediately.
params	Parameter structure describing the topic metric collector and the callbacks to be invoked.
api_error	Populated on API error. Can be NULL.

Returns

true if the operation was successful. False, otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

bool diffusion_metrics_remove_session_metric_collector	(	SESSION_T *	session,
		const DIFFUSION_METRICS_REMOVE_SESSION_METRIC_COLLECTOR_PARAMS_T	params,
		DIFFUSION_API_ERROR *	api_error
	)

Removes any session metric collector with the given name, if it exists.

Parameters

session	The current session. If NULL, this function returns immediately.
params	Parameter structure describing the session metric collector name and the callbacks to be invoked.
api_error	Populated on API error. Can be NULL.

Returns

true if the operation was successful. False, otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

bool diffusion_metrics_remove_topic_metric_collector	(	SESSION_T *	session,
		const DIFFUSION_METRICS_REMOVE_TOPIC_METRIC_COLLECTOR_PARAMS_T	params,
		DIFFUSION_API_ERROR *	api_error
	)

Removes any topic metric collector with the given name, if it exists.

Parameters

session	The current session. If NULL, this function returns immediately.
params	Parameter structure describing the topic metric collector name and the callbacks to be invoked.
api_error	Populated on API error. Can be NULL.

Returns

true if the operation was successful. False, otherwise. In this case, if a non-NULL api_error pointer has been provided, this will be populated with the error information and should be freed with diffusion_api_error_free.

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T * diffusion_session_metric_collector_builder_export_to_prometheus	(	DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	builder,
		bool	export
	)

Specifies whether the metric collector should export metrics to Prometheus or not.

Limit the number of groups maintained by this metric collector.

The default is that metrics are not exported to Prometheus.

Parameters

builder	the session metric collector builder
export	true to export metrics to Prometheus

Returns

the session metric collector builder

Since

6.7

Session metric collectors can group metrics by properties. This property places an upper limit on the number of groups that will be maintained for the metric collector.

For example, if a session metric collector groups by $SessionId and maximum_groups is 10, then metrics will only be collected for the first 10 sessions.

Parameters

builder	the session metric collector builder
ma	true to export metrics to Prometheus

Returns

the session metric collector builder

Since

6.7

void diffusion_session_metric_collector_builder_free

(

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *

builder

)

Free a session metric collector builder.

Parameters

builder

the session metric collector builder

Since

6.7

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T* diffusion_session_metric_collector_builder_group_by_properties	(	DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	builder,
		LIST_T *	property_names
	)

Specifies a list of session property names to group by, replacing any current list known to this builder.

Parameters

builder	the session metric collector builder
property_names	a list of session property names. See session.h for details of session properties

Returns

the session metric collector builder

Since

6.7

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T* diffusion_session_metric_collector_builder_group_by_property	(	DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	builder,
		char *	property_name
	)

Adds the name of a session property to group by to the list known to this builder.

By default a builder will initially have no session properties to group by set.

Parameters

builder	the session metric collector builder
property_name	the name of the session property. See session.h for details of session properties

Returns

the session metric collector builder

Since

6.7

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T* diffusion_session_metric_collector_builder_init

(

)

Initialize a new session metric collector builder.

diffusion_session_metric_collector_builder_free should be called on this pointer when no longer needed.

Returns

the session metric collector builder

Since

6.7

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T* diffusion_session_metric_collector_builder_maximum_groups	(	DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	builder,
		int	limit
	)

Set the maximum number of groups maintained by the metric collector.

By default, the number of groups is not limited.

Parameters

builder	the session metric collector builder
limit	a positive integer

Returns

the session metric collector builder

Since

6.8

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T* diffusion_session_metric_collector_builder_remove_metrics_with_no_matches	(	DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *	builder,
		bool	remove
	)

Specifies whether the metric collector should remove any metrics that have no matches.

The default is that the metric collector will not remove metrics with no matches.

Parameters

builder	the session metric collector builder
remove	true to indicate that metrics with no matches should be removed

Returns

the session metric collector builder

Since

6.7

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T* diffusion_session_metric_collector_builder_reset

(

DIFFUSION_SESSION_METRIC_COLLECTOR_BUILDER_T *

builder

)

Reset the session metric collector builder's internal values.

Parameters

builder

the session metric collector builder

Returns

the session metric collector builder

Since

6.7

bool diffusion_session_metric_collector_compare	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector_1,
		DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector_2
	)

Compares two session metric collectors.

Parameters

collector_1	a session metric collector
collector_2	another session metric collector

Returns

true if both session metric collectors are identical.

Since

6.7

bool diffusion_session_metric_collector_exports_to_prometheus	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector,
		bool *	exports
	)

Indicates whether the metric collector exports to Prometheus.

Parameters

collector	the session metric collector
exports	the variable that will receive the bool value if present

Returns

true if the collector is valid and extracted the value

Since

6.7

void diffusion_session_metric_collector_free

(

DIFFUSION_SESSION_METRIC_COLLECTOR_T *

collector

)

Free a session metric collector.

Parameters

collector

the session metric collector

Since

6.7

bool diffusion_session_metric_collector_get_group_by_properties	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector,
		LIST_T **	group_by
	)

Returns the list of properties to group by.

Parameters

collector	the session metric collector
group_by	the variable that will receive the list value if present

Returns

true if the collector is valid and extracted the value

Since

6.7

bool diffusion_session_metric_collector_get_name	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector,
		char **	name
	)

Returns the name of the session metric collector.

Parameters

collector	the session metric collector
name	the variable that will receive the name if present

Returns

true if the collector is valid and extracted the value

Since

6.7

bool diffusion_session_metric_collector_get_session_filter	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector,
		char **	session_filter
	)

Returns the session filter of the session metric collector.

Parameters

collector	the session metric collector
session_filter	the variable that will receive the session filter if present

Returns

true if the collector is valid and extracted the value

Since

6.7

bool diffusion_session_metric_collector_maximum_groups	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector,
		int *	maximum_groups
	)

Limit the number of groups maintained by this metric collector.

Session metric collectors can group metrics by properties. This property places an upper limit on the number of groups that will be maintained for the metric collector.

For example, if a session metric collector groups by $SessionId and maximum_groups is 10, then metrics will only be collected for the first 10 sessions.

Parameters

collector	the session metric collector
exports	the variable that will receive the int value if present

Returns

true if the collector is valid and extracted the value

Since

6.8

bool diffusion_session_metric_collector_removes_metrics_with_no_matches	(	DIFFUSION_SESSION_METRIC_COLLECTOR_T *	collector,
		bool *	removes
	)

Indicates whether metrics with no matches should be removed.

Parameters

collector	the session metric collector
removes	the variable that will receive the bool value if present

Returns

true if the collector is valid and extracted the value

Since

6.7

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T* diffusion_topic_metric_collector_builder_export_to_prometheus	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	builder,
		bool	export
	)

Specifies whether the metric collector should export metrics to Prometheus or not.

The default is that metrics are not exported to Prometheus.

Parameters

builder	the topic metric collector builder
export	true to export metrics to Prometheus

Returns

the topic metric collector builder

Since

6.7

void diffusion_topic_metric_collector_builder_free

(

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *

builder

)

Free a topic metric collector builder.

Parameters

builder

the topic metric collector builder

Since

6.7

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T* diffusion_topic_metric_collector_builder_group_by_path_prefix_parts	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	builder,
		int	parts
	)

Specifies the number of leading parts of the topic path the metric collector should use to group results.

By default a topic metric collector does not group by the topic path prefix. If a positive number of parts is specified, it will enable grouping.

Parameters

builder	the topic metric collector builder
parts	the number of leading parts of the topic path to group by; set to 0 to disable grouping by path

Returns

the topic metric collector builder

Since

6.8

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T* diffusion_topic_metric_collector_builder_group_by_topic_type	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	builder,
		bool	group_by_topic_type
	)

Specifies whether the metric collector should group by topic type.

By default a topic metric collector does not group by topic type.

Parameters

builder	the topic metric collector builder
group_by_topic_type	true to indicate that the collector should group by topic type

Returns

the topic metric collector builder

Since

6.7

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T* diffusion_topic_metric_collector_builder_init

(

)

Initialize a new topic metric collector builder.

diffusion_session_topic_collector_builder_free should be called on this pointer when no longer needed.

Returns

the topic metric collector builder

Since

6.7

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T* diffusion_topic_metric_collector_builder_maximum_groups	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *	builder,
		int	limit
	)

Set the maximum number of groups maintained by the metric collector.

By default, the number of groups is not limited.

Parameters

builder	the session metric collector builder
limit	a positive integer

Returns

the topic metric collector builder

Since

6.8

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T* diffusion_topic_metric_collector_builder_reset

(

DIFFUSION_TOPIC_METRIC_COLLECTOR_BUILDER_T *

builder

)

Reset the topic metric collector builder's internal values.

Parameters

builder

the topic metric collector builder

Returns

the topic metric collector builder

Since

6.7

bool diffusion_topic_metric_collector_compare	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector_1,
		DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector_2
	)

Compares two topic metric collectors.

Parameters

collector_1	a topic metric collector
collector_2	another topic metric collector

Returns

true if both topic metric collectors are identical.

Since

6.7

bool diffusion_topic_metric_collector_exports_to_prometheus	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector,
		bool *	exports
	)

Indicates whether the metric collector exports to Prometheus.

Parameters

collector	the topic metric collector
exports	the variable that will receive the bool value if present

Returns

true if the collector is valid and extracted the value

Since

6.7

void diffusion_topic_metric_collector_free

(

DIFFUSION_TOPIC_METRIC_COLLECTOR_T *

collector

)

Free a topic metric collector.

Parameters

collector

the topic metric collector

Since

6.7

bool diffusion_topic_metric_collector_get_name	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector,
		char **	name
	)

Returns the name of the topic metric collector.

Parameters

collector	the topic metric collector
name	the variable that will receive the name if present

Returns

true if the collector is valid and extracted the value

Since

6.7

bool diffusion_topic_metric_collector_get_topic_selector	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector,
		char **	topic_selector
	)

Returns the topic selector of the topic metric collector.

Parameters

collector	the topic metric collector
topic_selector	the variable that will receive the topic selector if present

Returns

true if the collector is valid and extracted the value

Since

6.7

bool diffusion_topic_metric_collector_group_by_path_prefix_parts	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector,
		int *	group_by_path_prefix_parts
	)

Specifies the number of leading parts of the topic path to group by, or 0, if the collector does not group by path prefix.

Parameters

collector	the topic metric collector
group_by_path_prefix_parts	the variable that will receive the int value if present

Returns

true if the collector is valid and extracted the value

Since

6.8

bool diffusion_topic_metric_collector_groups_by_topic_type	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector,
		bool *	groups_by_topic_type
	)

Specifies whether the metric collector should group by topic type.

Parameters

collector	the topic metric collector
groups_by_topic_type	the variable that will receive the bool value if present

Returns

true if the collector is valid and extracted the value

Since

6.7

bool diffusion_topic_metric_collector_maximum_groups	(	DIFFUSION_TOPIC_METRIC_COLLECTOR_T *	collector,
		int *	maximum_groups
	)

Limit the number of groups maintained by this metric collector.

Topic metric collectors can group metrics by properties. This property places an upper limit on the number of groups that will be maintained for the metric collector.

Parameters

collector	the topic metric collector
exports	the variable that will receive the int value if present

Returns

true if the collector is valid and extracted the value

Since

6.8