add logging

collector/cmd/collector/main.go

@@ -38,7 +38,7 @@ func main() {
 	writer := collector.NewCollectdWriter(*h, os.Stdout)
 
 	collector := collector.NewCollector(client, writer, *i)
-
+	log.Println("Starting")
 	err = collector.Run(5)
 	if err != nil {
 		log.Fatal(err)

collector/collector.go

@@ -55,6 +55,7 @@ func (c *Collector) Run(interval int) error {
 	}
 
 	for _, container := range containers {
+		log.Printf("starting collector for container %s\n", container.ID)
 		go c.handle(container.ID)
 	}
 
@@ -70,6 +71,7 @@ func (c *Collector) Run(interval int) error {
 
 func (c *Collector) handle(id string) {
 	m, err := NewMonitor(c.client, id, c.interval)
+	log.Println("Error? %e", err)
 	if err != nil {
 		if err == ErrNoNeedToMonitor {
 			return

collector/monitor.go

@@ -2,6 +2,7 @@ package collector
 
 import (
 	"errors"
+	"log"
 	"strings"
 
 	"github.com/fsouza/go-dockerclient"
@@ -79,6 +80,7 @@ func (m *Monitor) handle(ch chan<- Stats) error {
 				Stats: *s,
 			}
 
+			log.Println("Polling for %s %s", m.app, m.task)
 			i++
 		}
 	}()