prom_counter.h File Reference

https://prometheus.io/docs/concepts/metric_types/#counter More...

#include <stdlib.h>
#include "prom_metric.h"

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Typedefs
typedef prom_metric_t	prom_counter_t
	Prometheus metric: counter. More...

Functions
prom_counter_t *	prom_counter_new (const char *name, const char *help, size_t label_key_count, const char **label_keys)
	Construct a new metric of type counter (or short: counter). More...
int	prom_counter_destroy (prom_counter_t *self)
	Destroys the given counter. More...
int	prom_counter_inc (prom_counter_t *self, const char **label_values)
	Increment the given counter by 1. More...
int	prom_counter_add (prom_counter_t *self, double r_value, const char **label_values)
	Add the value to the give counter. More...
int	prom_counter_reset (prom_counter_t *self, double r_value, const char **label_values)
	Reset the given counter to the given value. More...

Detailed Description

https://prometheus.io/docs/concepts/metric_types/#counter

Typedef Documentation

prom_counter_t

typedef prom_metric_t prom_counter_t

Prometheus metric: counter.

References

• See https://prometheus.io/docs/concepts/metric_types/#counter

Function Documentation

prom_counter_add()

int prom_counter_add	(	prom_counter_t *	self,
		double	r_value,
		const char **	label_values
	)

Add the value to the give counter.

Parameters

self	Where to add the value.
r_value	Value to add. MUST be >= 0.
label_values	The label values associated with the counter sample being updated. The number of labels must match the value passed as label_key_count in the counter's constructor. If no label values are necessary, pass NULL. Otherwise, it may be convenient to pass this value as a literal.

Returns

A non-zero integer value upon failure, 0 otherwise.

Example

// An example with labels prom_counter_add(foo_counter, 22, (const char**) { "bar", "bang" });

// An example without labels prom_counter_add(foo_counter, 22, NULL);

prom_counter_destroy()

int prom_counter_destroy

(

prom_counter_t *

self

)

Destroys the given counter.

Parameters

self	Counter to destroy.

Returns

A non-zero integer value upon failure, 0 otherwise.

Note

No matter what gets returned, you should never use any metric passed to this function but set it to NULL .

prom_counter_inc()

int prom_counter_inc	(	prom_counter_t *	self,
		const char **	label_values
	)

Increment the given counter by 1.

Parameters

self	counter to increment.
label_values	The label values associated with the counter sample being updated. The number of labels must match the value passed as label_key_count in the counter's constructor. If no label values are necessary, pass NULL. Otherwise, it may be convenient to pass this value as a literal.

Returns

A non-zero integer value upon failure, 0 otherwise.

Example

// An example with labels prom_counter_inc(foo_counter, (const char**) { "bar", "bang" });

// An example without labels prom_counter_inc(foo_counter, NULL);

prom_counter_new()

prom_counter_t* prom_counter_new	(	const char *	name,
		const char *	help,
		size_t	label_key_count,
		const char **	label_keys
	)

Construct a new metric of type counter (or short: counter).

Parameters

name	Name of the counter.
help	Short counter description.
label_key_count	The number of labels associated with the given counter. Pass 0 if the counter does not require labels.
label_keys	A collection of label keys. The number of keys MUST match the value passed as label_key_count. If no labels are required, pass NULL. Otherwise, it may be convenient to pass this value as a literal.

Returns

The new prom counter on success, NULL otherwise.

Example

// An example with labels prom_counter_new("foo", "foo is a counter with labels", 2, (const char**) { "one", "two" });

// An example without labels prom_counter_new("foo", "foo is a counter without labels", 0, NULL);

prom_counter_reset()

int prom_counter_reset	(	prom_counter_t *	self,
		double	r_value,
		const char **	label_values
	)

Reset the given counter to the given value.

Parameters

self	Where to set the given value.
r_value	Value to set. MUST be >= 0.
label_values	The label values associated with the counter sample being updated. The number of labels must match the value passed as label_key_count in the counter's constructor. If no label values are necessary, pass NULL. Otherwise, it may be convenient to pass this value as a literal.

Returns

A non-zero integer value upon failure, 0 otherwise.