16345: "arvados-server check" detects clock skew.

[arvados.git] / services / health / main.go

diff --git a/services/health/main.go b/services/health/main.go
index bc57d36d04b1158cd8c6ade4191a63eed5fad354..92bd377c800041583ded6c6b161e88332639f69b 100644 (file)
--- a/services/health/main.go
+++ b/services/health/main.go
@@ -20,8 +20,18 @@ var (
        command cmd.Handler = service.Command(arvados.ServiceNameHealth, newHandler)
 )
 
-func newHandler(ctx context.Context, cluster *arvados.Cluster, _ string, _ *prometheus.Registry) service.Handler {
-       return &health.Aggregator{Cluster: cluster}
+func newHandler(ctx context.Context, cluster *arvados.Cluster, _ string, reg *prometheus.Registry) service.Handler {
+       mClockSkew := prometheus.NewGauge(prometheus.GaugeOpts{
+               Namespace: "arvados",
+               Subsystem: "health",
+               Name:      "clock_skew_seconds",
+               Help:      "Clock skew observed in most recent health check",
+       })
+       reg.MustRegister(mClockSkew)
+       return &health.Aggregator{
+               Cluster:         cluster,
+               MetricClockSkew: mClockSkew,
+       }
 }
 
 func main() {