Gauge

See Gauge for the concept.

Call Set() with a value:

#include <registry.h>

int main()
{
    auto config = Config(WriterConfig(WriterTypes::UDP));
    auto r = Registry(config);

    // Option 1: Directly create a Gauge
    auto serverQueueSize = r.CreateGauge("server.queueSize");
    serverQueueSize.Set(10);

    // Option 2: Create a Gauge from a MeterID
    auto serverQueueMeter = r.CreateNewId("server.queueSize");
    r.CreateGauge(serverQueueMeter).Set(10);
}

Gauges will report the last set value for 15 minutes. This done so that updates to the values do not need to be collected on a tight 1-minute schedule to ensure that Atlas shows unbroken lines in graphs. A custom TTL may be configured for gauges. SpectatorD enforces a minimum TTL of 5 seconds.

#include <registry.h>

int main()
{
    auto config = Config(WriterConfig(WriterTypes::UDP));
    auto r = Registry(config);

    // Option 1: Directly create a Gauge
    auto serverQueueSize = r.CreateGauge("server.queueSize", {}, 120);
    serverQueueSize.Set(10);

    // Option 2: Create a Gauge from a MeterID
    auto serverQueueMeter = r.CreateNewId("server.queueSize");
    r.CreateGauge(serverQueueMeter, 120).Set(10);
}