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twin-gatus/metrics/metrics.go

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package metrics
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import (
"strconv"
"github.com/TwiN/gatus/v3/core"
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"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
const namespace = "gatus" // The prefix of the metrics
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var (
initializedMetrics bool // Whether the metrics have been initialized
resultTotal *prometheus.CounterVec
resultDurationSeconds *prometheus.GaugeVec
resultConnectedTotal *prometheus.CounterVec
resultCodeTotal *prometheus.CounterVec
resultCertificateExpirationSeconds *prometheus.GaugeVec
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)
func initializePrometheusMetrics() {
resultTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Name: "results_total",
Help: "Number of results per endpoint",
}, []string{"key", "group", "name", "type", "success"})
resultDurationSeconds = promauto.NewGaugeVec(prometheus.GaugeOpts{
Namespace: namespace,
Name: "results_duration_seconds",
Help: "Duration of the request in seconds",
}, []string{"key", "group", "name", "type"})
resultConnectedTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Name: "results_connected_total",
Help: "Total number of results in which a connection was successfully established",
}, []string{"key", "group", "name", "type"})
resultCodeTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Name: "results_code_total",
Help: "Total number of results by code",
}, []string{"key", "group", "name", "type", "code"})
resultCertificateExpirationSeconds = promauto.NewGaugeVec(prometheus.GaugeOpts{
Namespace: namespace,
Name: "results_certificate_expiration_seconds",
Help: "Number of seconds until the certificate expires",
}, []string{"key", "group", "name", "type"})
}
// PublishMetricsForEndpoint publishes metrics for the given endpoint and its result.
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// These metrics will be exposed at /metrics if the metrics are enabled
func PublishMetricsForEndpoint(endpoint *core.Endpoint, result *core.Result) {
if !initializedMetrics {
initializePrometheusMetrics()
initializedMetrics = true
}
endpointType := endpoint.Type()
resultTotal.WithLabelValues(endpoint.Key(), endpoint.Group, endpoint.Name, string(endpointType), strconv.FormatBool(result.Success)).Inc()
resultDurationSeconds.WithLabelValues(endpoint.Key(), endpoint.Group, endpoint.Name, string(endpointType)).Set(result.Duration.Seconds())
if result.Connected {
resultConnectedTotal.WithLabelValues(endpoint.Key(), endpoint.Group, endpoint.Name, string(endpointType)).Inc()
}
if result.DNSRCode != "" {
resultCodeTotal.WithLabelValues(endpoint.Key(), endpoint.Group, endpoint.Name, string(endpointType), result.DNSRCode).Inc()
}
if result.HTTPStatus != 0 {
resultCodeTotal.WithLabelValues(endpoint.Key(), endpoint.Group, endpoint.Name, string(endpointType), strconv.Itoa(result.HTTPStatus)).Inc()
}
if result.CertificateExpiration != 0 {
resultCertificateExpirationSeconds.WithLabelValues(endpoint.Key(), endpoint.Group, endpoint.Name, string(endpointType)).Set(result.CertificateExpiration.Seconds())
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}
}