Minutely probes are a mechanism to periodically send custom metrics to AppSignal. In minutely intervals from when the probe was first created, a user-defined function can be called in which you can capture metrics in order to send them to AppSignal. As minutely probes are instances of EventEmitters, they are asynchronous.

Creating probes

If you need to track more custom metrics from your app than our the default probes that ship with our integrations, you can add your own probe(s).

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const meter = appsignal.metrics()
const probes = meter.probes()

// the callback is fired once every minute from when 
// `register` is called
probes.register("database", () => {
  meter.setGauge("database_size", 10)
})