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Add Consul-SD metrics (#2097)

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* Add Consul-SD metrics

* Remove unnecessary metric and add labels to summary.

* Do not stutter
This commit is contained in:
Dominik Schulz 2016-10-21 09:59:43 +02:00 committed by Brian Brazil
parent 5273b55a0c
commit 0c69227616
1 changed files with 37 additions and 0 deletions
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37
retrieval/discovery/consul/consul.go
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@ -21,6 +21,7 @@ import (
"time"
consul "github.com/hashicorp/consul/api"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
"golang.org/x/net/context"
@ -48,8 +49,37 @@ const (
datacenterLabel = model.MetaLabelPrefix + "consul_dc"
// serviceIDLabel is the name of the label containing the service ID.
serviceIDLabel = model.MetaLabelPrefix + "consul_service_id"
// Constants for instrumentation.
namespace = "prometheus"
)
var (
rpcFailuresCount = prometheus.NewCounter(
prometheus.CounterOpts{
Namespace: namespace,
Name: "sd_consul_rpc_failures_total",
Help: "The number of Consul RPC call failures.",
})
rpcDuration = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Namespace: namespace,
Name: "sd_consul_rpc_duration_seconds",
Help: "The duration of a Consul RPC call in seconds.",
},
[]string{"endpoint", "call"},
)
)
func init() {
prometheus.MustRegister(rpcFailuresCount)
prometheus.MustRegister(rpcDuration)
// Initialize metric vectors.
rpcDuration.WithLabelValues("catalog", "service")
rpcDuration.WithLabelValues("catalog", "services")
}
// Discovery retrieves target information from a Consul server
// and updates them via watches.
type Discovery struct {
@ -110,10 +140,12 @@ func (cd *Discovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
var lastIndex uint64
for {
catalog := cd.client.Catalog()
t0 := time.Now()
srvs, meta, err := catalog.Services(&consul.QueryOptions{
WaitIndex: lastIndex,
WaitTime: watchTimeout,
})
rpcDuration.WithLabelValues("catalog", "services").Observe(time.Since(t0).Seconds())
// We have to check the context at least once. The checks during channel sends
// do not guarantee that.
@ -125,6 +157,7 @@ func (cd *Discovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
if err != nil {
log.Errorf("Error refreshing service list: %s", err)
rpcFailuresCount.Inc()
time.Sleep(retryInterval)
continue
}
@ -202,10 +235,13 @@ func (srv *consulService) watch(ctx context.Context, ch chan<- []*config.TargetG
lastIndex := uint64(0)
for {
t0 := time.Now()
nodes, meta, err := catalog.Service(srv.name, "", &consul.QueryOptions{
WaitIndex: lastIndex,
WaitTime: watchTimeout,
})
rpcDuration.WithLabelValues("catalog", "service").Observe(time.Since(t0).Seconds())
// Check the context before potentially falling in a continue-loop.
select {
case <-ctx.Done():
@ -216,6 +252,7 @@ func (srv *consulService) watch(ctx context.Context, ch chan<- []*config.TargetG
if err != nil {
log.Errorf("Error refreshing service %s: %s", srv.name, err)
rpcFailuresCount.Inc()
time.Sleep(retryInterval)
continue
}