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metrics.go
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metrics.go
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package jobs
import (
"strconv"
"sync/atomic"
"github.com/prometheus/client_golang/prometheus"
"github.com/roadrunner-server/pool/fsm"
)
const (
namespace = "rr_jobs"
)
type statsExporter struct {
jobsOk *uint64
pushOk *uint64
jobsErr *uint64
pushErr *uint64
pushOkDesc *prometheus.Desc
pushErrDesc *prometheus.Desc
jobsErrDesc *prometheus.Desc
jobsOkDesc *prometheus.Desc
pushJobLatencyHistogram *prometheus.HistogramVec
pushJobRequestCounter *prometheus.CounterVec
defaultExporter *StatsExporter
}
func (p *Plugin) MetricsCollector() []prometheus.Collector {
// p - implements Exporter interface (workers)
return []prometheus.Collector{p.metrics}
}
func (se *statsExporter) CountJobOk() {
atomic.AddUint64(se.jobsOk, 1)
}
func (se *statsExporter) CountJobErr() {
atomic.AddUint64(se.jobsErr, 1)
}
func (se *statsExporter) CountPushOk() {
atomic.AddUint64(se.pushOk, 1)
}
func (se *statsExporter) CountPushErr() {
atomic.AddUint64(se.pushErr, 1)
}
func newStatsExporter(stats Informer) *statsExporter {
return &statsExporter{
defaultExporter: &StatsExporter{
TotalWorkersDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "total_workers"), "Total number of workers used by the plugin", nil, nil),
TotalMemoryDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "workers_memory_bytes"), "Memory usage by workers.", nil, nil),
StateDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "worker_state"), "Worker current state", []string{"state", "pid"}, nil),
WorkerMemoryDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "worker_memory_bytes"), "Worker current memory usage", []string{"pid"}, nil),
WorkersReady: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "workers_ready"), "Workers currently in ready state", nil, nil),
WorkersWorking: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "workers_working"), "Workers currently in working state", nil, nil),
WorkersInvalid: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "workers_invalid"), "Workers currently in invalid,killing,destroyed,errored,inactive states", nil, nil),
Workers: stats,
},
jobsOk: toPtr(uint64(0)),
pushOk: toPtr(uint64(0)),
jobsErr: toPtr(uint64(0)),
pushErr: toPtr(uint64(0)),
pushOkDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "push_ok"), "Number of job push", nil, nil),
pushErrDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "push_err"), "Number of jobs push which was failed", nil, nil),
jobsErrDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "jobs_err"), "Number of jobs error while processing in the worker", nil, nil),
jobsOkDesc: prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "jobs_ok"), "Number of successfully processed jobs", nil, nil),
pushJobLatencyHistogram: prometheus.NewHistogramVec(prometheus.HistogramOpts{
Name: prometheus.BuildFQName(namespace, "", "push_latency"),
Help: "Histogram represents latency for pushed operation",
}, []string{"job", "driver", "source"}),
pushJobRequestCounter: prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Name: "requests_total",
Help: "The total number of requests sent to the JOBS plugin",
}, []string{"job", "driver", "source"}),
}
}
func (se *statsExporter) Describe(d chan<- *prometheus.Desc) {
// send description
se.defaultExporter.Describe(d)
d <- se.pushErrDesc
d <- se.pushOkDesc
d <- se.jobsErrDesc
d <- se.jobsOkDesc
se.pushJobLatencyHistogram.Describe(d)
se.pushJobRequestCounter.Describe(d)
}
func (se *statsExporter) Collect(ch chan<- prometheus.Metric) {
// get the copy of the processes
se.defaultExporter.Collect(ch)
// send the values to the prometheus
ch <- prometheus.MustNewConstMetric(se.jobsOkDesc, prometheus.GaugeValue, float64(atomic.LoadUint64(se.jobsOk)))
ch <- prometheus.MustNewConstMetric(se.jobsErrDesc, prometheus.GaugeValue, float64(atomic.LoadUint64(se.jobsErr)))
ch <- prometheus.MustNewConstMetric(se.pushOkDesc, prometheus.GaugeValue, float64(atomic.LoadUint64(se.pushOk)))
ch <- prometheus.MustNewConstMetric(se.pushErrDesc, prometheus.GaugeValue, float64(atomic.LoadUint64(se.pushErr)))
se.pushJobLatencyHistogram.Collect(ch)
se.pushJobRequestCounter.Collect(ch)
}
func toPtr[T any](v T) *T {
return &v
}
// ---- Default exporter ----
type StatsExporter struct {
TotalMemoryDesc *prometheus.Desc
StateDesc *prometheus.Desc
WorkerMemoryDesc *prometheus.Desc
TotalWorkersDesc *prometheus.Desc
WorkersReady *prometheus.Desc
WorkersWorking *prometheus.Desc
WorkersInvalid *prometheus.Desc
Workers Informer
}
func (s *StatsExporter) Describe(d chan<- *prometheus.Desc) {
// send description
d <- s.TotalWorkersDesc
d <- s.TotalMemoryDesc
d <- s.StateDesc
d <- s.WorkerMemoryDesc
d <- s.WorkersReady
d <- s.WorkersWorking
d <- s.WorkersInvalid
}
func (s *StatsExporter) Collect(ch chan<- prometheus.Metric) {
// get the copy of the processes
workerStates := s.Workers.Workers()
// cumulative RSS memory in bytes
var cum float64
var ready float64
var working float64
var invalid float64
// collect the memory
for i := 0; i < len(workerStates); i++ {
cum += float64(workerStates[i].MemoryUsage)
ch <- prometheus.MustNewConstMetric(s.StateDesc, prometheus.GaugeValue, 0, workerStates[i].StatusStr, strconv.Itoa(int(workerStates[i].Pid)))
ch <- prometheus.MustNewConstMetric(s.WorkerMemoryDesc, prometheus.GaugeValue, float64(workerStates[i].MemoryUsage), strconv.Itoa(int(workerStates[i].Pid)))
// sync with sdk/worker/state.go
switch workerStates[i].Status {
case fsm.StateReady:
ready++
case fsm.StateWorking:
working++
default:
invalid++
}
}
ch <- prometheus.MustNewConstMetric(s.WorkersReady, prometheus.GaugeValue, ready)
ch <- prometheus.MustNewConstMetric(s.WorkersWorking, prometheus.GaugeValue, working)
ch <- prometheus.MustNewConstMetric(s.WorkersInvalid, prometheus.GaugeValue, invalid)
// send the values to the prometheus
ch <- prometheus.MustNewConstMetric(s.TotalWorkersDesc, prometheus.GaugeValue, float64(len(workerStates)))
ch <- prometheus.MustNewConstMetric(s.TotalMemoryDesc, prometheus.GaugeValue, cum)
}