Automatic doctor run: adding scuba event for run status

Summary:
Follow up diff for D63265563.

## This change
Add scuba logs for doctor run status

## Query
https://fburl.com/daiquery/8tyonop2

Differential Revision: D65039167

fbshipit-source-id: 7b168ba58d2392e9fb97f0c6b75382399e142749

eden/fs/service/EdenServer.cpp

@@ -2761,7 +2761,10 @@ void EdenServer::runEdenDoctor() {
   folly::CPUThreadPoolExecutor executor(1);
   auto systemConfigDir = config_->getEdenConfig()->getSystemConfigDir();
   auto edenDir = getEdenDir();
-  executor.add([systemConfigDir, edenDir] {
+  auto structuredLogger = structuredLogger_;
+  executor.add([systemConfigDir, edenDir, structuredLogger] {
+    auto doctorRunStatus = AutoEdenDoctorRunEvent::Success;
+    auto statusReason = std::string();
     try {
       XLOG(INFO, "Running periodic eden doctor dry-run.");
       // Not passing Options field cause "0x57" error. ref: D59783277
@@ -2794,11 +2797,19 @@ void EdenServer::runEdenDoctor() {
         XLOG(
             ERR,
             "EdenFS doctor dry run failed or timed-out. Check edenfs doctor scuba logs for more info.");
+        doctorRunStatus = AutoEdenDoctorRunEvent::TimeoutOrFailure;
       }
     } catch (const std::exception& e) {
       XLOG(ERR)
           << "Exception occurred while trying to run periodic doctor dry-run: "
           << e.what();
+      doctorRunStatus = AutoEdenDoctorRunEvent::ProcessCreationFailure;
+      statusReason = e.what();
+    }
+
+    if (structuredLogger) {
+      structuredLogger->logEvent(
+          AutoEdenDoctorRunEvent{doctorRunStatus, statusReason});
     }
   });
 }

eden/fs/telemetry/LogEvent.h

@@ -752,4 +752,43 @@ struct FileAccessEvent : public EdenFSFileAccessEvent {
   }
 };
 
+/**
+ * Used to log status of automatic doctor runs
+ */
+struct AutoEdenDoctorRunEvent : public EdenFSEvent {
+  enum RunStatus : uint8_t {
+    Success = 0,
+    ProcessCreationFailure = 1,
+    TimeoutOrFailure = 2
+  };
+
+  RunStatus run_status;
+  std::string failure_reason;
+
+  explicit AutoEdenDoctorRunEvent(
+      RunStatus run_status,
+      std::string failure_reason)
+      : run_status(run_status), failure_reason(std::move(failure_reason)) {}
+
+  void populate(DynamicEvent& event) const override {
+    if (run_status == Success) {
+      event.addString("run_status", "Success");
+    } else if (run_status == ProcessCreationFailure) {
+      event.addString("run_status", "ProcessCreationFailure");
+    } else if (run_status == TimeoutOrFailure) {
+      event.addString("run_status", "TimeoutOrFailure");
+    } else {
+      // Logging numerical value in case there is no string mapping here
+      event.addString("run_status", std::to_string(run_status));
+    }
+
+    // Re-using existing column
+    event.addString("reason", failure_reason);
+  }
+
+  const char* getType() const override {
+    return "auto_eden_doctor_run_events";
+  }
+};
+
 } // namespace facebook::eden