Add support for multi train logging

Test: atest GtsStatsdHostTestCases
Change-Id: I4ca7089347d6dfab8a33c07acd5ef9c252413ec9
diff --git a/cmds/statsd/src/logd/LogEvent.h b/cmds/statsd/src/logd/LogEvent.h
index 5509c09..a67bef4 100644
--- a/cmds/statsd/src/logd/LogEvent.h
+++ b/cmds/statsd/src/logd/LogEvent.h
@@ -56,6 +56,9 @@
     std::string trainName;
     int32_t status;
     std::vector<int64_t> experimentIds;
+    bool requiresStaging;
+    bool rollbackEnabled;
+    bool requiresLowLatencyMonitor;
 };
 
 /**