github.com/letsencrypt/boulder@v0.20251208.0/observer/monitor.go (about)

     1  package observer
     2  
     3  import (
     4  	"strconv"
     5  	"time"
     6  
     7  	blog "github.com/letsencrypt/boulder/log"
     8  	"github.com/letsencrypt/boulder/observer/probers"
     9  )
    10  
    11  type monitor struct {
    12  	period time.Duration
    13  	prober probers.Prober
    14  }
    15  
    16  // start spins off a 'Prober' goroutine on an interval of `m.period`
    17  // with a timeout of half `m.period`
    18  func (m monitor) start(logger blog.Logger) {
    19  	ticker := time.NewTicker(m.period)
    20  	timeout := m.period / 2
    21  	for {
    22  		go func() {
    23  			// Attempt to probe the configured target.
    24  			success, dur := m.prober.Probe(timeout)
    25  
    26  			// Produce metrics to be scraped by Prometheus.
    27  			histObservations.WithLabelValues(
    28  				m.prober.Name(), m.prober.Kind(), strconv.FormatBool(success),
    29  			).Observe(dur.Seconds())
    30  
    31  			// Log the outcome of the probe attempt.
    32  			logger.Infof(
    33  				"kind=[%s] success=[%v] duration=[%f] name=[%s]",
    34  				m.prober.Kind(), success, dur.Seconds(), m.prober.Name())
    35  		}()
    36  		<-ticker.C
    37  	}
    38  }