add 'avg_uptime' gague

Makefile

@@ -15,9 +15,9 @@ release: clean
  -a -tags netgo \
  -ldflags "-X main.Version=$(VERSION)" \
  -o bin/$(TARGET) .
+ docker build -t gettyimages/$(TARGET):$(VERSION) .
 
 publish: release
- docker build -t gettyimages/$(TARGET):$(VERSION) .
  docker push gettyimages/$(TARGET):$(VERSION)
  docker tag gettyimages/$(TARGET):$(VERSION) gettyimages/$(TARGET):latest
  docker push gettyimages/$(TARGET):latest

exporter.go

@@ -88,7 +88,7 @@ func (e *Exporter) scrape(ch chan<- prometheus.Metric) {
 }
 
 func (e *Exporter) exportApps(ch chan<- prometheus.Metric) (err error) {
- content, err := e.scraper.Scrape("v2/apps")
+ content, err := e.scraper.Scrape("v2/apps?embed=apps.taskStats")
  if err != nil {
  log.Debugf("Problem scraping v2/apps endpoint: %v\n", err)
  return
@@ -132,6 +132,7 @@ func (e *Exporter) scrapeApps(json *gabs.Container, ch chan<- prometheus.Metric)
  "mem_in_mb": "mem",
  "disk_in_mb": "disk",
  "gpus": "gpus",
+ "avg_uptime": "taskStats.startedAfterLastScaling.stats.lifeTime.averageSeconds",
  }
 
  for _, app := range elements {

main.go

@@ -8,7 +8,7 @@ import (
  "net/url"
  "time"
 
- "github.com/gambol99/go-marathon"
+ "github.com/matt-deboer/go-marathon"
  "github.com/prometheus/client_golang/prometheus"
  "github.com/prometheus/common/log"
 )