Add additional Vector configuration options (#4301)

Author: dustin-decker

pkg/pb/source_metadatapb/source_metadata.pb.go

@@ -338,6 +338,8 @@ message Vector {
   google.protobuf.Timestamp timestamp = 1;
   string source_type = 2;
   string host = 3;
+  string locator = 4;
+  string link = 5;
 }
 
 message Webhook {

pkg/pb/source_metadatapb/source_metadata.pb.validate.go

@@ -474,6 +474,14 @@ message Webhook {
   oneof credential {
     credentials.Header header = 2;
   }
+  oneof variant {
+    Vector vector = 4;
+  }
+}
+
+message Vector {
+  string locator_field = 1;
+  string link_format = 2;
 }
 
 message Elasticsearch {