Add pod ip to via downward API to Trace Attributes

Provide additional attributes for tracing associations

Modified the helm templates to add the pod IP, and the jaeger injector to add it to the
standard attributes

Deploying should show the ip as a trace attribute

Fixes #13980

Signed-off-by: Justin <[email protected]>

Author: jseiser

charts/partials/templates/_proxy.tpl

@@ -19,6 +19,10 @@ env:
   valueFrom:
     fieldRef:
       fieldPath: metadata.uid
+- name: _pod_ip
+  valueFrom:
+    fieldRef:
+      fieldPath: status.podIP
 - name: _pod_nodeName
   valueFrom:
     fieldRef:

jaeger/injector/mutator/patch.go

@@ -51,7 +51,7 @@ const tpl = `[
     "path": "/spec/{{.ProxyPath}}/env/-",
     "value": {
       "name": "LINKERD2_PROXY_TRACE_EXTRA_ATTRIBUTES",
-      "value": "k8s.pod.uid=$(_pod_uid)\nk8s.container.name=$(_pod_containerName)"
+      "value": "k8s.pod.ip=${_pod_ip}\nk8s.pod.uid=$(_pod_uid)\nk8s.container.name=$(_pod_containerName)"
     }
   },
   {