Library: Prometheus
Package: Core
Header: Poco/Prometheus/Counter.h
Description
A generic counter supporting labels.
To create a Counter with labels and register it with the default Registry:
Counter sampleCounter("sample_counter"s, {
.help = "A sample counter"s,
.labelNames = {"label1"s, "label2"s}
});
To increment a Counter (with labels):
sampleCounter.labels({"value1"s, "value2"}).inc();
To create a Counter without labels and register it with the default Registry:
Counter simpleCounter("simple_counter"s);
simpleCounter.help("A simple counter"s);
To increment the value of a Counter (without labels):
simpleCounter.inc(42);
Inheritance
Direct Base Classes: LabeledMetricImpl < CounterSample >
All Base Classes: LabeledMetricImpl < CounterSample >
Member Summary
Member Functions: createSample, exportTo, help, inc, labelNames, value, writeSample
Nested Classes
struct Params
Constructors
Counter
explicit Counter(
const std::string & name
);
Creates a Counter with the given name and registers it with the default registry.
Counter
Counter(
const std::string & name,
const Params & params
);
Creates a Counter with the given name and parameters registers it with the default registry.
Counter
Counter(
const std::string & name,
Registry * pRegistry
);
Creates a Counter with the given name and registers it with the given registry (if not nullptr).
Counter
Counter(
const std::string & name,
const Params & params,
Registry * pRegistry
);
Creates a Counter with the given name and params, and registers it with the given registry (if not nullptr).
Destructor
~Counter
~Counter() = default;
Destroys the Counter.
Member Functions
exportTo
void exportTo(
Exporter & exporter
) const override;
help 
Counter & help(
const std::string & text
);
inc
void inc(
double v = 1.0
);
Increments the counter's current value.
Can only be used if no labels have been defined.
labelNames
Counter & labelNames(
const std::vector < std::string > & labelNames
);
value
double value() const;
Returns the counter's current value.
Can only be used if no labels have been defined.
createSample 
std::unique_ptr < CounterSample > createSample() const override;
writeSample
void writeSample(
Exporter & exporter,
const std::vector < std::string > & labelValues,
const CounterSample & sample
) const override;