Add separate Make target for auth-proxy.

Also fix Makefile deps for push: and collect auth-proxy metrics
for collectd-exporter.

Bug: skia:
Change-Id: I19274ef4307f1be1d894e962eb44a709cf3c7e64
Reviewed-on: https://skia-review.googlesource.com/c/174604
Auto-Submit: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
diff --git a/kube/Makefile b/kube/Makefile
index 3f061ec..c09cb6f 100644
--- a/kube/Makefile
+++ b/kube/Makefile
@@ -25,6 +25,10 @@
 	./build_reposync_release
 	pushk repo-sync
 
-push: pushk
+push: release_auth_proxy release_continuous_deploy release_configmap_reload
 	pushk --cluster=skia-public auth-proxy configmap-reload continuous-deploy
 	pushk --cluster=skia-corp configmap-reload
+
+pushk_authproxy: release_auth_proxy
+	pushk --cluster=skia-public auth-proxy
+
diff --git a/promk/prometheus/prometheus-public.yml b/promk/prometheus/prometheus-public.yml
index 6513fa4..afb6d7a 100644
--- a/promk/prometheus/prometheus-public.yml
+++ b/promk/prometheus/prometheus-public.yml
@@ -21,6 +21,7 @@
     static_configs:
       - targets: ['prometheus:10000']
       - targets: ['grafana:10000']
+      - targets: ['collectd-exporter:10000']
 
   - job_name: 'kubernetes-apiservers'