Define a tracker interface and replace auth token tracking

Summary:
Define the tracker interface and replace the existing authentication token verification tracking.

Subsequent diffs will add analytics for remaining connectivity areas.

Need to answer:
- No tokens rate over time
- Unable to verify tokens rate over time

Reviewed By: antonk52

Differential Revision: D46219661

fbshipit-source-id: dfc41cae664bc1ef211d312990120111fca3808b

desktop/flipper-server-core/src/utils/tracker.tsx

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {getLogger} from 'flipper-common';
+
+type TrackerEvents = {
+  'server-auth-token-verification': {
+    successful: boolean;
+    present: boolean;
+    error?: string;
+  };
+};
+
+class ServerCoreTracker {
+  track<Event extends keyof TrackerEvents>(
+    event: Event,
+    payload: TrackerEvents[Event],
+  ): void {
+    getLogger().track('usage', event, payload);
+  }
+}
+
+export const tracker = new ServerCoreTracker();