[Squash] Address feedback

Note that the Engine proxy strips all error information from the traces
with noErrorTraces set. To get errors to show up in the ui, the proxy
sends error counts inside of the aggregated stats reports. To get
similar behavior inside of the apollo server metrics reporting, we
always send a trace and mask out the PII.

docs/source/api/apollo-server.md

@@ -345,6 +345,6 @@ addMockFunctionsToSchema({
    'sendReport()' on other signals if you'd like. Note that 'sendReport()'
    does not run synchronously so it cannot work usefully in an 'exit' handler.
 
-*  `sendErrorTraces`: boolean
+*  `maskErrorDetails`: boolean
 
-   To remove errors from traces, set this to false. Defaults to true
+   Set to true to remove error details from the traces sent to Apollo's servers. Defaults to false.

packages/apollo-engine-reporting/src/agent.ts

@@ -81,8 +81,8 @@ export interface EngineReportingOptions {
   handleSignals?: boolean;
   // Sends the trace report immediately. This options is useful for stateless environments
   sendReportsImmediately?: boolean;
-  // To remove errors from traces, set this to false. Defaults to true
-  sendErrorTraces?: boolean;
+  // To remove the error message from traces, set this to true. Defaults to false
+  maskErrorDetails?: boolean;
 
   // XXX Provide a way to set client_name, client_version, client_address,
   // service, and service_version fields. They are currently not revealed in the

packages/apollo-engine-reporting/src/extension.ts

@@ -44,7 +44,7 @@ export class EngineReportingExtension<TContext = any>
     addTrace: (signature: string, operationName: string, trace: Trace) => void,
   ) {
     this.options = {
-      sendErrorTraces: true,
+      maskErrorDetails: false,
       ...options,
     };
     this.addTrace = addTrace;
@@ -229,19 +229,16 @@ export class EngineReportingExtension<TContext = any>
           }
         }
 
-        // With noErrorTraces, the Engine proxy strips all error information
-        // from the traces and sends error counts inside of the aggregated stats
-        // reports. To get similar behavior inside of the apollo server metrics
-        // reporting, we always send a trace and mask out the PII
-        const errorInfo = this.options.sendErrorTraces
-          ? {
+        // Always send the trace errors, so that the UI acknowledges that there is an error.
+        const errorInfo = this.options.maskErrorDetails
+          ? { message: '<masked>' }
+          : {
               message: error.message,
               location: (error.locations || []).map(
                 ({ line, column }) => new Trace.Location({ line, column }),
               ),
               json: JSON.stringify(error),
-            }
-          : { message: 'Masked by Apollo Engine Reporting' };
+            };
 
         node!.error!.push(new Trace.Error(errorInfo));
       });