Wrap the node info to metadata in the Access Log Protocol (#93)

ebpf/accesslog.proto

@@ -32,8 +32,8 @@ service EBPFAccessLogService {
 }
 
 message EBPFAccessLogMessage {
-    // current node information, only not null when first message or have update
-    EBPFAccessLogNodeInfo node = 1;
+    // metadata of access log, only not null when first message
+    EBPFAccessLogMetadata metadata = 1;
     // local process and remote process connection information
     AccessLogConnection connection = 2;
     // kernel level metrics
@@ -44,6 +44,18 @@ message EBPFAccessLogMessage {
     AccessLogProtocolLogs protocolLog = 4;
 }
 
+message EBPFAccessLogMetadata {
+    // current node information
+    EBPFAccessLogNodeInfo node = 1;
+    // policy for access logs
+    EBPFAccessLogPolicy policy = 2;
+}
+
+message EBPFAccessLogPolicy {
+    // which namespaces should be excluded to generate the connection
+    repeated string excludeNamespaces = 1;
+}
+
 message EBPFAccessLogNodeInfo {
     // Node name
     string name = 1;