Update prometheus with thanos configuration (#237)

Author: ventris

modules/prometheus.py

@@ -169,13 +169,16 @@ def requires(host, *args):
 
 
 def generate(host, *args):
+    current_event = lib.get_current_event()
+
     info = {}
     local_targets = []
     local_targets.append({
         'job_name': 'prometheus',
         'scheme': 'http',
         'static_configs': [{'targets': ['localhost:9090']}]})
     info['prometheus'] = generate_backend(host, local_targets)
+    info['current_event'] = current_event
 
     return info
 

modules/prometheus/manifests/init.pp

@@ -12,8 +12,11 @@
 # [*scrape_configs*]
 #   Map of the same structure as Prometheus' scrape_configs.
 #
+# [*current_event*]
+#   The current event name, e.g. dhs19
+#
 
-class prometheus ($scrape_configs) {
+class prometheus ($scrape_configs, $current_event = '') {
 
   #Create user/group for Prometheus
   group { 'prometheus':

modules/prometheus/templates/prometheus.yaml.erb

@@ -2,6 +2,9 @@
   'global' => {
     'scrape_interval' => '30s',
     'scrape_timeout' => '25s',
+    'external_labels' => {
+      'cluster' => 'event-@current_event'
+    }
   },
   'rule_files' => [
     '/opt/prometheus/rules/*.prom.yml',