merge updateHistoryGraph behavior into update flag

lib/servers.js

@@ -14,7 +14,7 @@ class ServerRegistration {
     this._pingHistory = []
   }
 
-  getUpdate (timestamp, resp, err, version) {
+  getUpdate (timestamp, resp, err, version, updateHistoryGraph) {
     const update = {
       serverId: this.serverId,
       timestamp: timestamp
@@ -55,6 +55,12 @@ class ServerRegistration {
         if (this.findNewGraphPeak()) {
           update.graphPeakData = this.getGraphPeak()
         }
+
+        // Handled inside logToDatabase to validate logic from #getUpdate call
+        // Only append when true since an undefined value == false
+        if (updateHistoryGraph) {
+          update.updateHistoryGraph = true
+        }
       }
     } else if (err) {
       // Append a filtered copy of err