Added example for secret expansion, updated to go 1.20

Author: mustafaakin

.github/workflows/test.yml

@@ -6,10 +6,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.19
+    - name: Set up Go 1.20
       uses: actions/setup-go@v3
       with:
-        go-version: 1.19
+        go-version: 1.20
       id: go
 
     - name: Check out code into the Go module directory

.gitignore

@@ -1,3 +1,2 @@
 .idea/
-.DS_Store
-fork.sh
+.DS_Store

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19 AS builder
+FROM golang:1.20 AS builder
 
 ADD . /app
 WORKDIR /app

README.md

@@ -68,6 +68,11 @@ receivers:
 * A route can have many sub-routes, forming a tree.
 * Routing starts from the root route.
 
+## Using Secrets
+
+In your config file, you can refer to environment variables as `${API_KEY}` therefore you can use ConfigMap or Secrets 
+to keep the config file clean of secrets.
+
 ## Troubleshoot "Events Discarded" warning:
 
 - If there are `client-side throttling` warnings in the event-exporter log:

config.example.yaml

@@ -36,6 +36,7 @@ receivers:
       hosts:
         - "http://localhost:9200"
       indexFormat: "kube-events-{2006-01-02}"
+      apiKey: ${ELASTIC_API_KEY}
   - name: "opensearch-dump"
     opensearch:
       hosts: