Enable tracing loki in helm chart (#496)

* Enable tracing loki in helm chart

Tracing support from #328, need to support config in helm chart

Signed-off-by: Xiang Dai <764524258@qq.com>

* Use camel case for variables

Signed-off-by: Xiang Dai <764524258@qq.com>

* update condition

Signed-off-by: Xiang Dai <764524258@qq.com>

production/helm/loki/Chart.yaml

@@ -1,5 +1,5 @@
 name: loki
-version: 0.7.0
+version: 0.7.1
 appVersion: 0.0.1
 kubeVersion: "^1.10.0-0"
 description: "Loki: like Prometheus, but for logs."

production/helm/loki/templates/deployment.yaml

@@ -69,6 +69,9 @@ spec:
             {{- toYaml .Values.resources | nindent 12 }}
           securityContext:
             readOnlyRootFilesystem: true
+          env:
+            - name: JAEGER_AGENT_HOST
+              value: "{{ .Values.tracing.jaegerAgentHost }}"
       nodeSelector:
         {{- toYaml .Values.nodeSelector | nindent 8 }}
       affinity:

production/helm/loki/values.yaml

@@ -14,8 +14,13 @@ affinity: {}
 ## Deployment annotations
 annotations: {}
 
+# enable tracing for debug, need install jaeger and specify right jaeger_agent_host
+tracing:
+  jaegerAgentHost:
+
 config:
   auth_enabled: false
+
   ingester:
     chunk_idle_period: 15m
     lifecycler:
@@ -128,7 +133,7 @@ securityContext:
 
 service:
   type: ClusterIP
-  nodePort: 
+  nodePort:
   port: 3100
   annotations: {}
   labels: {}