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actor_metrics.go
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actor_metrics.go
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package telemetry
import (
"fmt"
"go.opentelemetry.io/otel/metric"
)
// ActorMetrics define the type of metrics we are collecting
// from an actor
type ActorMetrics struct {
// captures the number of times a given actor has panic
PanicCount metric.Int64ObservableCounter
// captures the actor mailbox size
MailboxSize metric.Int64ObservableGauge
// captures the number of time the actor has restarted
RestartedCount metric.Int64ObservableCounter
// captures the count of messages received by the actor
ReceivedCount metric.Int64ObservableCounter
// captures the duration of message received and processed
ReceivedDurationHistogram metric.Float64Histogram
}
// NewMetrics creates an instance of ActorMetrics
func NewMetrics(meter metric.Meter) (*ActorMetrics, error) {
// create an instance of metrics
metrics := new(ActorMetrics)
var err error
// set the various counters
if metrics.PanicCount, err = meter.Int64ObservableCounter(
failureCounterName,
metric.WithDescription("The total number of failures(panic) by the actor"),
); err != nil {
return nil, fmt.Errorf("failed to create failure count instrument, %v", err)
}
if metrics.MailboxSize, err = meter.Int64ObservableGauge(
mailboxGaugeName,
metric.WithDescription("The number of messages in point in time by the actor"),
); err != nil {
return nil, fmt.Errorf("failed to create mailbix count instrument, %v", err)
}
if metrics.RestartedCount, err = meter.Int64ObservableCounter(
restartedCounterName,
metric.WithDescription("The total number of restart")); err != nil {
return nil, fmt.Errorf("failed to create restart count instrument, %v", err)
}
if metrics.ReceivedCount, err = meter.Int64ObservableCounter(
receivedCounterName, metric.WithDescription("The total number of messages received")); err != nil {
return nil, fmt.Errorf("failed to create received count instrument, %v", err)
}
if metrics.ReceivedDurationHistogram, err = meter.Float64Histogram(
receivedDurationHistogramName,
metric.WithDescription("The latency of received message in milliseconds"),
metric.WithUnit("ms"),
); err != nil {
return nil, fmt.Errorf("failed to create latency instrument, %v", err)
}
return metrics, nil
}