f5cc502874
1) Breaking changes! Updated collection code for proper Prometheus support - Now metrics names of all subcollectors have prefixes: nsq_topic_, nsq_channel_, nsq_client_ As a result metrics registration code now passing Prometheus' client validation, also it fixes scrape warnings - "type" label in exported metrics removed as obsolete 2) Add reset of gauges before scrape (like in haproxy-exporter) 3) Refactor: subcollectors logic is simplified, multiple collectors support removed We always use 'stats' collector so it removes unnecessary flexibility and complexity.
85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
package collector
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
// NsqExecutor collects all NSQ metrics from the registered collectors.
|
|
// This type implements the prometheus.Collector interface and can be
|
|
// registered in the metrics collection.
|
|
//
|
|
// The executor takes the time needed for scraping nsqd stat endpoint and
|
|
// provides an extra metric for this. This metric is labeled with the
|
|
// scrape result ("success" or "error").
|
|
type NsqExecutor struct {
|
|
nsqdURL string
|
|
|
|
collectors []StatsCollector
|
|
summary *prometheus.SummaryVec
|
|
mutex sync.RWMutex
|
|
}
|
|
|
|
// NewNsqExecutor creates a new executor for collecting NSQ metrics.
|
|
func NewNsqExecutor(namespace, nsqdURL string) *NsqExecutor {
|
|
sum := prometheus.NewSummaryVec(prometheus.SummaryOpts{
|
|
Namespace: namespace,
|
|
Subsystem: "exporter",
|
|
Name: "scrape_duration_seconds",
|
|
Help: "Duration of a scrape job of the NSQ exporter",
|
|
}, []string{"result"})
|
|
prometheus.MustRegister(sum)
|
|
return &NsqExecutor{
|
|
nsqdURL: nsqdURL,
|
|
summary: sum,
|
|
}
|
|
}
|
|
|
|
// Use configures a specific stats collector, so the stats could be
|
|
// exposed to the Prometheus system.
|
|
func (e *NsqExecutor) Use(c StatsCollector) {
|
|
e.mutex.Lock()
|
|
defer e.mutex.Unlock()
|
|
e.collectors = append(e.collectors, c)
|
|
}
|
|
|
|
// Describe implements the prometheus.Collector interface.
|
|
func (e *NsqExecutor) Describe(ch chan<- *prometheus.Desc) {
|
|
for _, c := range e.collectors {
|
|
c.describe(ch)
|
|
}
|
|
}
|
|
|
|
// Collect implements the prometheus.Collector interface.
|
|
func (e *NsqExecutor) Collect(out chan<- prometheus.Metric) {
|
|
start := time.Now()
|
|
e.mutex.Lock()
|
|
defer e.mutex.Unlock()
|
|
|
|
// reset state, because metrics can gone
|
|
for _, c := range e.collectors {
|
|
c.reset()
|
|
}
|
|
|
|
stats, err := getNsqdStats(e.nsqdURL)
|
|
tScrape := time.Since(start).Seconds()
|
|
|
|
result := "success"
|
|
if err != nil {
|
|
result = "error"
|
|
}
|
|
|
|
e.summary.WithLabelValues(result).Observe(tScrape)
|
|
|
|
if err == nil {
|
|
for _, c := range e.collectors {
|
|
c.set(stats)
|
|
}
|
|
for _, c := range e.collectors {
|
|
c.collect(out)
|
|
}
|
|
}
|
|
}
|