func ExampleGaugeVec() {
binaryVersion := flag.String("binary_version", "debug", "Version of the binary: debug, canary, production.")
flag.Parse()
opsQueued := prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "our_company",
Subsystem: "blob_storage",
Name: "ops_queued",
Help: "Number of blob storage operations waiting to be processed, partitioned by user and type.",
ConstLabels: prometheus.Labels{"binary_version": *binaryVersion},
},
[]string{
// Which user has requested the operation?
"user",
// Of what type is the operation?
"type",
},
)
prometheus.MustRegister(opsQueued)
// Increase a value using compact (but order-sensitive!) WithLabelValues().
opsQueued.WithLabelValues("bob", "put").Add(4)
// Increase a value with a map using WithLabels. More verbose, but order
// doesn't matter anymore.
opsQueued.With(prometheus.Labels{"type": "delete", "user": "******"}).Inc()
}
// NewClusterManager creates the two metric vectors OOMCount and RAMUsage. Note
// that the zone is set as a ConstLabel. (It's different in each instance of the
// ClusterManager, but constant over the lifetime of an instance.) The reported
// values are partitioned by host, which is therefore a variable label.
func NewClusterManager(zone string) *ClusterManager {
return &ClusterManager{
Zone: zone,
OOMCount: prometheus.NewCounterVec(
prometheus.CounterOpts{
Subsystem: "clustermanager",
Name: "oom_count",
Help: "number of OOM crashes",
ConstLabels: prometheus.Labels{"zone": zone},
},
[]string{"host"},
),
RAMUsage: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Subsystem: "clustermanager",
Name: "ram_usage_bytes",
Help: "RAM usage as reported to the cluster manager",
ConstLabels: prometheus.Labels{"zone": zone},
},
[]string{"host"},
),
}
}