diff --git a/test/e2e-v2/cases/mysql/prometheus-mysql-exporter/otel-collector-config.yaml b/test/e2e-v2/cases/mysql/prometheus-mysql-exporter/otel-collector-config.yaml
index 1aef6ab8b3..77844c95e4 100644
--- a/test/e2e-v2/cases/mysql/prometheus-mysql-exporter/otel-collector-config.yaml
+++ b/test/e2e-v2/cases/mysql/prometheus-mysql-exporter/otel-collector-config.yaml
@@ -27,6 +27,14 @@ processors:
   batch:
 
 exporters:
+  ####################################################################################
+  # If you want to use otlp exporter please ensure that your OAP version is >= 9.2.0 #
+  # or you can use oc exporter, The config format should be:                         #
+  # opencensus:                                                                      #
+  #   endpoint: "oap:11800"                                                          #
+  #   tls:                                                                           #
+  #      insecure: true                                                              #
+  ####################################################################################
   otlp:
     endpoint: oap:11800
     tls:
@@ -39,4 +47,8 @@ service:
       processors:
       - batch
       exporters:
+      #########################################
+      # oc exporter config format:            #
+      # - opencensus                          #
+      #########################################
       - otlp
diff --git a/test/e2e-v2/cases/postgresql/postgres-exporter/otel-collector-config.yaml b/test/e2e-v2/cases/postgresql/postgres-exporter/otel-collector-config.yaml
index fa66082549..f2193f6e1f 100644
--- a/test/e2e-v2/cases/postgresql/postgres-exporter/otel-collector-config.yaml
+++ b/test/e2e-v2/cases/postgresql/postgres-exporter/otel-collector-config.yaml
@@ -25,6 +25,14 @@ processors:
   batch:
 
 exporters:
+  ####################################################################################
+  # If you want to use otlp exporter please ensure that your OAP version is >= 9.2.0 #
+  # or you can use oc exporter, The config format should be:                         #
+  # opencensus:                                                                      #
+  #   endpoint: "oap:11800"                                                          #
+  #   tls:                                                                           #
+  #      insecure: true                                                              #
+  ####################################################################################
   otlp:
     endpoint: oap:11800
     tls:
@@ -39,5 +47,9 @@ service:
       processors:
         - batch
       exporters:
+        #########################################
+        # oc exporter config format:            #
+        # - opencensus                          #
+        #########################################
         - logging
-        - otlp
+        - otlp
\ No newline at end of file
diff --git a/test/e2e-v2/cases/vm/prometheus-node-exporter/otel-collector-config.yaml b/test/e2e-v2/cases/vm/prometheus-node-exporter/otel-collector-config.yaml
index d92cebf7b5..511809125e 100644
--- a/test/e2e-v2/cases/vm/prometheus-node-exporter/otel-collector-config.yaml
+++ b/test/e2e-v2/cases/vm/prometheus-node-exporter/otel-collector-config.yaml
@@ -26,6 +26,14 @@ processors:
   batch:
 
 exporters:
+  ####################################################################################
+  # If you want to use otlp exporter please ensure that your OAP version is >= 9.2.0 #
+  # or you can use oc exporter, The config format should be:                         #
+  # opencensus:                                                                      #
+  #   endpoint: "oap:11800"                                                          #
+  #   tls:                                                                           #
+  #      insecure: true                                                              #
+  ####################################################################################
   otlp:
     endpoint: "oap:11800" # The OAP Server address
     ###############################################################################
@@ -47,4 +55,8 @@ service:
     metrics:
       receivers: [prometheus]
       processors: [batch]
+      #########################################
+      # oc exporter config format:            #
+      # exporters: [opencensus,logging]       #
+      #########################################
       exporters: [otlp, logging]