Add unix timestamp of the last service state change to runit collector

1 files changed, 16 insertions, 4 deletions

diff --git a/collector/runit.go b/collector/runit.go
index 72ab685..4aad744 100644
--- a/collector/runit.go
+++ b/collector/runit.go
@@ -9,7 +9,7 @@ import (
 )
 
 type runitCollector struct {
-        state, stateDesired, stateNormal *prometheus.GaugeVec
+        state, stateDesired, stateNormal, stateTimestamp *prometheus.GaugeVec
 }
 
 func init() {
@@ -29,7 +29,7 @@ func NewRunitCollector() (Collector, error) {
                                 Namespace:   Namespace,
                                 Subsystem:   subsystem,
                                 Name:        "state",
-                                Help:        "state of runit service.",
+                                Help:        "State of runit service.",
                                 ConstLabels: constLabels,
                         },
                         labelNames,
@@ -39,7 +39,7 @@ func NewRunitCollector() (Collector, error) {
                                 Namespace:   Namespace,
                                 Subsystem:   subsystem,
                                 Name:        "desired_state",
-                                Help:        "desired state of runit service.",
+                                Help:        "Desired state of runit service.",
                                 ConstLabels: constLabels,
                         },
                         labelNames,
@@ -49,7 +49,17 @@ func NewRunitCollector() (Collector, error) {
                                 Namespace:   Namespace,
                                 Subsystem:   subsystem,
                                 Name:        "normal_state",
-                                Help:        "normal state of runit service.",
+                                Help:        "Normal state of runit service.",
+                                ConstLabels: constLabels,
+                        },
+                        labelNames,
+                ),
+                stateTimestamp: prometheus.NewGaugeVec(
+                        prometheus.GaugeOpts{
+                                Namespace:   Namespace,
+                                Subsystem:   subsystem,
+                                Name:        "state_last_change_timestamp_seconds",
+                                Help:        "Unix timestamp of the last runit service state change.",
                                 ConstLabels: constLabels,
                         },
                         labelNames,
@@ -73,6 +83,7 @@ func (c *runitCollector) Update(ch chan<- prometheus.Metric) error {
                 log.Debugf("%s is %d on pid %d for %d seconds", service.Name, status.State, status.Pid, status.Duration)
                 c.state.WithLabelValues(service.Name).Set(float64(status.State))
                 c.stateDesired.WithLabelValues(service.Name).Set(float64(status.Want))
+                c.stateTimestamp.WithLabelValues(service.Name).Set(float64(status.Timestamp.Unix()))
                 if status.NormallyUp {
                         c.stateNormal.WithLabelValues(service.Name).Set(1)
                 } else {
@@ -82,6 +93,7 @@ func (c *runitCollector) Update(ch chan<- prometheus.Metric) error {
         c.state.Collect(ch)
         c.stateDesired.Collect(ch)
         c.stateNormal.Collect(ch)
+        c.stateTimestamp.Collect(ch)
 
         return nil
 }