Frontend performance metrics (#2439)

* Added enriched metrics

* Add more traces for observability

src/Common/dataAccess/readCollections.ts

@@ -5,6 +5,8 @@ import { CosmosDbArtifactType } from "Contracts/FabricMessagesContract";
 import { isFabric, isFabricMirroredKey } from "Platform/Fabric/FabricUtil";
 import { AuthType } from "../../AuthType";
 import * as DataModels from "../../Contracts/DataModels";
+import { Action } from "../../Shared/Telemetry/TelemetryConstants";
+import { traceFailure, traceStart, traceSuccess } from "../../Shared/Telemetry/TelemetryProcessor";
 import { FabricArtifactInfo, userContext } from "../../UserContext";
 import { logConsoleProgress } from "../../Utils/NotificationConsoleUtils";
 import { listCassandraTables } from "../../Utils/arm/generatedClients/cosmos/cassandraResources";
@@ -17,6 +19,11 @@ import { handleError } from "../ErrorHandlingUtils";
 
 export async function readCollections(databaseId: string): Promise<DataModels.Collection[]> {
   const clearMessage = logConsoleProgress(`Querying containers for database ${databaseId}`);
+  const startKey = traceStart(Action.ReadCollections, {
+    dataExplorerArea: "ResourceTree",
+    databaseId,
+    apiType: userContext.apiType,
+  });
 
   if (isFabricMirroredKey() && userContext.fabricContext?.databaseName === databaseId) {
     const collections: DataModels.Collection[] = [];
@@ -43,8 +50,10 @@ export async function readCollections(databaseId: string): Promise<DataModels.Co
 
       // Sort collections by id before returning
       collections.sort((a, b) => a.id.localeCompare(b.id));
+      traceSuccess(Action.ReadCollections, { databaseId, collectionCount: collections.length }, startKey);
       return collections;
     } catch (error) {
+      traceFailure(Action.ReadCollections, { databaseId, error: error?.message }, startKey);
       handleError(error, "ReadCollections", `Error while querying containers for database ${databaseId}`);
       throw error;
     } finally {
@@ -59,7 +68,9 @@ export async function readCollections(databaseId: string): Promise<DataModels.Co
       userContext.apiType !== "Tables" &&
       !isFabric()
     ) {
-      return await readCollectionsWithARM(databaseId);
+      const result = await readCollectionsWithARM(databaseId);
+      traceSuccess(Action.ReadCollections, { databaseId, collectionCount: result?.length, path: "ARM" }, startKey);
+      return result;
     }
 
     Logger.logInfo(`readCollections: calling fetchAll for database ${databaseId}`, "readCollections");
@@ -70,8 +81,14 @@ export async function readCollections(databaseId: string): Promise<DataModels.Co
         ?.length}, durationMs=${Date.now() - fetchAllStart}`,
       "readCollections",
     );
+    traceSuccess(
+      Action.ReadCollections,
+      { databaseId, collectionCount: sdkResponse.resources?.length, path: "SDK" },
+      startKey,
+    );
     return sdkResponse.resources as DataModels.Collection[];
   } catch (error) {
+    traceFailure(Action.ReadCollections, { databaseId, error: error?.message }, startKey);
     handleError(error, "ReadCollections", `Error while querying containers for database ${databaseId}`);
     throw error;
   } finally {
@@ -84,6 +101,11 @@ export async function readCollectionsWithPagination(
   continuationToken?: string,
 ): Promise<DataModels.CollectionsWithPagination> {
   const clearMessage = logConsoleProgress(`Querying containers for database ${databaseId}`);
+  const startKey = traceStart(Action.ReadCollections, {
+    dataExplorerArea: "ResourceTree",
+    databaseId,
+    paginated: true,
+  });
   try {
     const sdkResponse = await client()
       .database(databaseId)
@@ -99,8 +121,14 @@ export async function readCollectionsWithPagination(
       collections: sdkResponse.resources as DataModels.Collection[],
       continuationToken: sdkResponse.continuationToken,
     };
+    traceSuccess(
+      Action.ReadCollections,
+      { databaseId, collectionCount: collectionsWithPagination.collections?.length, paginated: true },
+      startKey,
+    );
     return collectionsWithPagination;
   } catch (error) {
+    traceFailure(Action.ReadCollections, { databaseId, error: error?.message, paginated: true }, startKey);
     handleError(error, "ReadCollections", `Error while querying containers for database ${databaseId}`);
     throw error;
   } finally {

src/Common/dataAccess/readDatabases.ts

@@ -2,6 +2,8 @@ import { CosmosDbArtifactType } from "Contracts/FabricMessagesContract";
 import { isFabric, isFabricMirroredKey, isFabricNative } from "Platform/Fabric/FabricUtil";
 import { AuthType } from "../../AuthType";
 import * as DataModels from "../../Contracts/DataModels";
+import { Action } from "../../Shared/Telemetry/TelemetryConstants";
+import { traceFailure, traceStart, traceSuccess } from "../../Shared/Telemetry/TelemetryProcessor";
 import { FabricArtifactInfo, userContext } from "../../UserContext";
 import { logConsoleProgress } from "../../Utils/NotificationConsoleUtils";
 import { listCassandraKeyspaces } from "../../Utils/arm/generatedClients/cosmos/cassandraResources";
@@ -14,6 +16,10 @@ import { handleError } from "../ErrorHandlingUtils";
 export async function readDatabases(): Promise<DataModels.Database[]> {
   let databases: DataModels.Database[];
   const clearMessage = logConsoleProgress(`Querying databases`);
+  const startKey = traceStart(Action.ReadDatabases, {
+    dataExplorerArea: "ResourceTree",
+    apiType: userContext.apiType,
+  });
 
   if (
     isFabricMirroredKey() &&
@@ -81,9 +87,11 @@ export async function readDatabases(): Promise<DataModels.Database[]> {
       databases = sdkResponse.resources as DataModels.Database[];
     }
   } catch (error) {
+    traceFailure(Action.ReadDatabases, { error: error?.message }, startKey);
     handleError(error, "ReadDatabases", `Error while querying databases`);
     throw error;
   }
+  traceSuccess(Action.ReadDatabases, { databaseCount: databases?.length }, startKey);
   clearMessage();
   return databases;
 }

src/Explorer/Explorer.tsx

@@ -636,6 +636,7 @@ export default class Explorer {
       dataExplorerArea: Constants.Areas.ResourceTree,
     });
 
+    scenarioMonitor.startPhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.CollectionsLoaded);
     try {
       await Promise.all(
         databasesToLoad.map(async (database: ViewModels.Database) => {
@@ -647,13 +648,16 @@ export default class Explorer {
           useTabs
             .getState()
             .refreshActiveTab((tab) => tab.collection && tab.collection.getDatabase().id() === database.id());
+        }),
+      );
       TelemetryProcessor.traceSuccess(
         Action.LoadCollections,
         { dataExplorerArea: Constants.Areas.ResourceTree },
         startKey,
       );
-        }),
+      scenarioMonitor.completePhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.CollectionsLoaded);
-      );
+      // Start DatabaseTreeRendered — React render cycle will complete it in ResourceTree
+      scenarioMonitor.startPhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.DatabaseTreeRendered);
     } catch (error) {
       TelemetryProcessor.traceFailure(
         Action.LoadCollections,
@@ -664,6 +668,7 @@ export default class Explorer {
         },
         startKey,
       );
+      scenarioMonitor.failPhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.CollectionsLoaded);
     }
   }
 
@@ -1203,10 +1208,15 @@ export default class Explorer {
     }
 
     if (userContext.apiType !== "Postgres" && userContext.apiType !== "VCoreMongo") {
-      this.databasesRefreshed =
+      if (userContext.authType === AuthType.ResourceToken) {
-        userContext.authType === AuthType.ResourceToken
+        scenarioMonitor.skipPhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.CollectionsLoaded);
-          ? this.refreshDatabaseForResourceToken()
+        scenarioMonitor.skipPhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.DatabaseTreeRendered);
-          : this.refreshAllDatabases();
+        this.databasesRefreshed = this.refreshDatabaseForResourceToken().then(() => {
+          scenarioMonitor.completePhase(MetricScenario.DatabaseLoad, ApplicationMetricPhase.DatabasesFetched);
+        });
+      } else {
+        this.databasesRefreshed = this.refreshAllDatabases();
+      }
       await this.databasesRefreshed; // await: we rely on the databases to be loaded before restoring the tabs further in the flow
     }
 
@@ -1274,16 +1284,23 @@ export default class Explorer {
       return;
     }
 
+    const startKey = TelemetryProcessor.traceStart(Action.RefreshSampleData, {
+      dataExplorerArea: Constants.Areas.ResourceTree,
+      databaseId,
+    });
     readSampleCollection()
       .then((collection: DataModels.Collection) => {
         if (!collection) {
+          TelemetryProcessor.traceSuccess(Action.RefreshSampleData, { sampleCollectionFound: false }, startKey);
           return;
         }
 
         const sampleDataResourceTokenCollection = new ResourceTokenCollection(this, databaseId, collection, true);
         useDatabases.setState({ sampleDataResourceTokenCollection });
+        TelemetryProcessor.traceSuccess(Action.RefreshSampleData, { sampleCollectionFound: true }, startKey);
       })
       .catch((error) => {
+        TelemetryProcessor.traceFailure(Action.RefreshSampleData, { error: getErrorMessage(error) }, startKey);
         Logger.logError(getErrorMessage(error), "Explorer/refreshSampleData");
       });
   }

src/Explorer/Notebook/useNotebook.ts

@@ -129,6 +129,9 @@ export const useNotebook: UseStore<NotebookState> = create((set, get) => ({
         : databaseAccount?.properties?.writeLocations?.[0]?.locationName.toLowerCase();
     const disallowedLocationsUri: string = `${configContext.PORTAL_BACKEND_ENDPOINT}/api/disallowedlocations`;
     const authorizationHeader = getAuthorizationHeader();
+    const startKey = TelemetryProcessor.traceStart(Action.RefreshNotebooksEnabled, {
+      dataExplorerArea: "Notebook",
+    });
     try {
       const response = await fetch(disallowedLocationsUri, {
         method: "POST",
@@ -155,9 +158,11 @@ export const useNotebook: UseStore<NotebookState> = create((set, get) => ({
       // firstWriteLocation should not be disallowed
       const isAccountInAllowedLocation = firstWriteLocation && disallowedLocations.indexOf(firstWriteLocation) === -1;
       set({ isNotebooksEnabledForAccount: isAccountInAllowedLocation });
+      TelemetryProcessor.traceSuccess(Action.RefreshNotebooksEnabled, { isAccountInAllowedLocation }, startKey);
     } catch (error) {
       Logger.logError(getErrorMessage(error), "Explorer/isNotebooksEnabledForAccount");
       set({ isNotebooksEnabledForAccount: false });
+      TelemetryProcessor.traceFailure(Action.RefreshNotebooksEnabled, { error: getErrorMessage(error) }, startKey);
     }
   },
   findItem: (root: NotebookContentItem, item: NotebookContentItem): NotebookContentItem => {
@@ -304,6 +309,9 @@ export const useNotebook: UseStore<NotebookState> = create((set, get) => ({
   setContainerStatus: (containerStatus: ContainerInfo) => set({ containerStatus }),
   getPhoenixStatus: async () => {
     if (get().isPhoenixNotebooks === undefined || get().isPhoenixFeatures === undefined) {
+      const startKey = TelemetryProcessor.traceStart(Action.CheckPhoenixStatus, {
+        dataExplorerArea: "Notebook",
+      });
       let isPhoenixNotebooks = false;
       let isPhoenixFeatures = false;
 
@@ -328,6 +336,7 @@ export const useNotebook: UseStore<NotebookState> = create((set, get) => ({
       }
       set({ isPhoenixNotebooks: isPhoenixNotebooks });
       set({ isPhoenixFeatures: isPhoenixFeatures });
+      TelemetryProcessor.traceSuccess(Action.CheckPhoenixStatus, { isPhoenixNotebooks, isPhoenixFeatures }, startKey);
     }
   },
   setIsPhoenixNotebooks: (isPhoenixNotebooks: boolean) => set({ isPhoenixNotebooks: isPhoenixNotebooks }),

src/Explorer/QueryCopilot/Shared/QueryCopilotClient.ts

@@ -63,20 +63,27 @@ export const isCopilotFeatureRegistered = async (subscriptionId: string): Promis
   const authorizationHeader: AuthorizationTokenHeaderMetadata = getAuthorizationHeader();
   const headers = { [authorizationHeader.header]: authorizationHeader.token };
 
+  const startKey = traceStart(Action.CheckCopilotFeatureRegistration, {
+    dataExplorerArea: Areas.Copilot,
+  });
   let response;
 
   try {
     response = await fetchWithTimeout(url, headers);
   } catch (error) {
+    traceFailure(Action.CheckCopilotFeatureRegistration, { error: String(error) }, startKey);
     return false;
   }
 
   if (!response?.ok) {
+    traceFailure(Action.CheckCopilotFeatureRegistration, { status: response?.status }, startKey);
     return false;
   }
 
   const featureRegistration = (await response?.json()) as FeatureRegistration;
-  return featureRegistration?.properties?.state === "Registered";
+  const registered = featureRegistration?.properties?.state === "Registered";
+  traceSuccess(Action.CheckCopilotFeatureRegistration, { registered }, startKey);
+  return registered;
 };
 
 export const getCopilotEnabled = async (): Promise<boolean> => {
@@ -86,20 +93,27 @@ export const getCopilotEnabled = async (): Promise<boolean> => {
   const authorizationHeader: AuthorizationTokenHeaderMetadata = getAuthorizationHeader();
   const headers = { [authorizationHeader.header]: authorizationHeader.token };
 
+  const startKey = traceStart(Action.GetCopilotEnabled, {
+    dataExplorerArea: Areas.Copilot,
+  });
   let response;
 
   try {
     response = await fetchWithTimeout(url, headers);
   } catch (error) {
+    traceFailure(Action.GetCopilotEnabled, { error: String(error) }, startKey);
     return false;
   }
 
   if (!response?.ok) {
+    traceFailure(Action.GetCopilotEnabled, { status: response?.status }, startKey);
     return false;
   }
 
   const copilotPortalConfiguration = (await response?.json()) as CopilotEnabledConfiguration;
-  return copilotPortalConfiguration?.isEnabled;
+  const isEnabled = copilotPortalConfiguration?.isEnabled;
+  traceSuccess(Action.GetCopilotEnabled, { isEnabled }, startKey);
+  return isEnabled;
 };
 
 export const allocatePhoenixContainer = async ({

src/Explorer/Tree/Database.tsx

@@ -158,9 +158,14 @@ export default class Database implements ViewModels.Database {
     if (restart) {
       this.collectionsContinuationToken = undefined;
     }
+    const startKey = TelemetryProcessor.traceStart(Action.LoadCollectionsPerDatabase, {
+      dataExplorerArea: Constants.Areas.ResourceTree,
+      databaseId: this.id(),
+    });
     const containerPaginationEnabled =
       StorageUtility.LocalStorageUtility.getEntryString(StorageUtility.StorageKey.ContainerPaginationEnabled) ===
       "true";
+    try {
       if (containerPaginationEnabled) {
         const collectionsWithPagination: DataModels.CollectionsWithPagination = await readCollectionsWithPagination(
           this.id(),
@@ -216,6 +221,19 @@ export default class Database implements ViewModels.Database {
       }
 
       useDatabases.getState().updateDatabase(this);
+      TelemetryProcessor.traceSuccess(
+        Action.LoadCollectionsPerDatabase,
+        { dataExplorerArea: Constants.Areas.ResourceTree, databaseId: this.id(), collectionCount: collections?.length },
+        startKey,
+      );
+    } catch (error) {
+      TelemetryProcessor.traceFailure(
+        Action.LoadCollectionsPerDatabase,
+        { dataExplorerArea: Constants.Areas.ResourceTree, databaseId: this.id(), error: error?.message },
+        startKey,
+      );
+      throw error;
+    }
   }
 
   public async openAddCollection(database: Database): Promise<void> {

src/Metrics/MetricScenarioConfigs.ts

@@ -3,15 +3,28 @@ import { ApplicationMetricPhase, CommonMetricPhase, ScenarioConfig } from "./Sce
 
 export const scenarioConfigs: Record<MetricScenario, ScenarioConfig> = {
   [MetricScenario.ApplicationLoad]: {
-    requiredPhases: [ApplicationMetricPhase.ExplorerInitialized, CommonMetricPhase.Interactive],
+    requiredPhases: [
+      ApplicationMetricPhase.PlatformConfigured,
+      ApplicationMetricPhase.CopilotConfigured,
+      ApplicationMetricPhase.SampleDataLoaded,
+      ApplicationMetricPhase.ExplorerInitialized,
+      CommonMetricPhase.Interactive,
+    ],
+    deferredPhases: [
+      ApplicationMetricPhase.CopilotConfigured,
+      ApplicationMetricPhase.SampleDataLoaded,
+      ApplicationMetricPhase.ExplorerInitialized,
+    ],
     timeoutMs: 10000,
   },
   [MetricScenario.DatabaseLoad]: {
     requiredPhases: [
       ApplicationMetricPhase.DatabasesFetched,
+      ApplicationMetricPhase.CollectionsLoaded,
       ApplicationMetricPhase.DatabaseTreeRendered,
       CommonMetricPhase.Interactive,
     ],
+    deferredPhases: [ApplicationMetricPhase.CollectionsLoaded, ApplicationMetricPhase.DatabaseTreeRendered],
     timeoutMs: 10000,
   },
 };

src/Metrics/ScenarioConfig.ts

@@ -9,7 +9,11 @@ export enum CommonMetricPhase {
 // Application-specific phases
 export enum ApplicationMetricPhase {
   ExplorerInitialized = "ExplorerInitialized",
+  PlatformConfigured = "PlatformConfigured",
+  CopilotConfigured = "CopilotConfigured",
+  SampleDataLoaded = "SampleDataLoaded",
   DatabasesFetched = "DatabasesFetched",
+  CollectionsLoaded = "CollectionsLoaded",
   DatabaseTreeRendered = "DatabaseTreeRendered",
 }
 
@@ -18,6 +22,7 @@ export type MetricPhase = CommonMetricPhase | ApplicationMetricPhase;
 
 export interface ScenarioConfig<TPhase extends string = MetricPhase> {
   requiredPhases: TPhase[];
+  deferredPhases?: TPhase[]; // Phases not auto-started at scenario start; started explicitly via startPhase()
   timeoutMs: number;
   validate?: (ctx: ScenarioContextSnapshot<TPhase>) => boolean; // Optional custom validation
 }

src/Metrics/ScenarioMonitor.test.ts

@@ -110,7 +110,13 @@ describe("ScenarioMonitor", () => {
       // Start scenario
       scenarioMonitor.start(MetricScenario.ApplicationLoad);
 
-      // Complete all phases to emit
+      // Complete all phases to emit (PlatformConfigured auto-started, deferred phases need start+complete)
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, CommonMetricPhase.Interactive);
 
@@ -161,13 +167,13 @@ describe("ScenarioMonitor", () => {
     it("emits healthy even with partial phase completion and expected failure", () => {
       scenarioMonitor.start(MetricScenario.ApplicationLoad);
 
-      // Complete one phase
+      // Complete one non-deferred phase
-      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
 
       // Mark expected failure
       scenarioMonitor.markExpectedFailure();
 
-      // Let timeout fire (Interactive phase not completed)
+      // Let timeout fire (deferred phases and Interactive not completed)
       jest.advanceTimersByTime(10000);
 
       expect(reportMetric).toHaveBeenCalledWith(
@@ -175,7 +181,7 @@ describe("ScenarioMonitor", () => {
           healthy: true,
           timedOut: true,
           hasExpectedFailure: true,
-          completedPhases: expect.arrayContaining(["ExplorerInitialized"]),
+          completedPhases: expect.arrayContaining(["PlatformConfigured"]),
         }),
       );
     });
@@ -216,7 +222,13 @@ describe("ScenarioMonitor", () => {
     it("emits healthy when all phases complete", () => {
       scenarioMonitor.start(MetricScenario.ApplicationLoad);
 
-      // Complete all required phases
+      // Complete all required phases (PlatformConfigured + Interactive auto-started, deferred need start)
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, CommonMetricPhase.Interactive);
 
@@ -225,7 +237,13 @@ describe("ScenarioMonitor", () => {
           scenario: MetricScenario.ApplicationLoad,
           healthy: true,
           timedOut: false,
-          completedPhases: expect.arrayContaining(["ExplorerInitialized", "Interactive"]),
+          completedPhases: expect.arrayContaining([
+            "PlatformConfigured",
+            "CopilotConfigured",
+            "SampleDataLoaded",
+            "ExplorerInitialized",
+            "Interactive",
+          ]),
         }),
       );
     });
@@ -233,8 +251,8 @@ describe("ScenarioMonitor", () => {
     it("does not emit until all phases complete", () => {
       scenarioMonitor.start(MetricScenario.ApplicationLoad);
 
-      // Complete only one phase
+      // Complete only one non-deferred phase
-      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
 
       expect(reportMetric).not.toHaveBeenCalled();
     });
@@ -246,7 +264,13 @@ describe("ScenarioMonitor", () => {
       scenarioMonitor.start(MetricScenario.ApplicationLoad);
       scenarioMonitor.start(MetricScenario.DatabaseLoad);
 
-      // Complete ApplicationLoad
+      // Complete ApplicationLoad (all phases including deferred)
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+      scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, CommonMetricPhase.Interactive);
 

src/Metrics/ScenarioMonitor.ts

@@ -87,8 +87,12 @@ class ScenarioMonitor {
       hasExpectedFailure: false,
     };
 
-    // Start all required phases at scenario start time
+    // Start all required phases at scenario start time, except deferred ones
+    const deferredSet = new Set(config.deferredPhases ?? []);
     config.requiredPhases.forEach((phase) => {
+      if (deferredSet.has(phase)) {
+        return; // Deferred phases are started explicitly via startPhase()
+      }
       const phaseStartMarkName = `scenario_${scenario}_${phase}_start`;
       performance.mark(phaseStartMarkName);
       ctx.phases.set(phase, { startMarkName: phaseStartMarkName });
@@ -135,6 +139,11 @@ class ScenarioMonitor {
     if (!ctx || ctx.emitted || !ctx.config.requiredPhases.includes(phase) || ctx.phases.has(phase)) {
       return;
     }
+    // Only deferred phases can be started via startPhase(); non-deferred are auto-started in start()
+    const isDeferredPhase = ctx.config.deferredPhases?.includes(phase) ?? false;
+    if (!isDeferredPhase) {
+      return;
+    }
 
     const startMarkName = `scenario_${scenario}_${phase}_start`;
     performance.mark(startMarkName);
@@ -147,10 +156,37 @@ class ScenarioMonitor {
     });
   }
 
+  /**
+   * Marks a phase as skipped (e.g. copilot disabled). Removes the phase from
+   * requiredPhases so it no longer blocks scenario completion.
+   */
+  skipPhase(scenario: MetricScenario, phase: MetricPhase) {
+    const ctx = this.contexts.get(scenario);
+    if (!ctx || ctx.emitted) {
+      return;
+    }
+    // Remove from requiredPhases so it doesn't block completion
+    ctx.config = {
+      ...ctx.config,
+      requiredPhases: ctx.config.requiredPhases.filter((p) => p !== phase),
+      deferredPhases: ctx.config.deferredPhases?.filter((p) => p !== phase),
+    };
+
+    this.devLog(`phase_skip: ${scenario}.${phase}`);
+
+    traceMark(Action.MetricsScenario, {
+      event: "phase_skip",
+      scenario,
+      phase,
+    });
+
+    this.tryEmitIfReady(ctx);
+  }
+
   completePhase(scenario: MetricScenario, phase: MetricPhase) {
     const ctx = this.contexts.get(scenario);
     const phaseCtx = ctx?.phases.get(phase);
-    if (!ctx || ctx.emitted || !ctx.config.requiredPhases.includes(phase) || !phaseCtx) {
+    if (!ctx || ctx.emitted || ctx.completed.has(phase) || !ctx.config.requiredPhases.includes(phase) || !phaseCtx) {
       return;
     }
 
@@ -356,8 +392,7 @@ class ScenarioMonitor {
 
   private cleanupPerformanceEntries(ctx: InternalScenarioContext) {
     performance.clearMarks(ctx.startMarkName);
-    ctx.config.requiredPhases.forEach((phase) => {
+    ctx.phases.forEach((phaseCtx, phase) => {
-      const phaseCtx = ctx.phases.get(phase);
       if (phaseCtx?.startMarkName) {
         performance.clearMarks(phaseCtx.startMarkName);
       }

src/Shared/Telemetry/TelemetryConstants.ts

@@ -152,6 +152,22 @@ export enum Action {
   CloudShellTerminalSession,
   OpenVSCode,
   ImportSampleData,
+
+  // Tracing for ApplicationLoad & DatabaseLoad scenarios
+  ConfigurePortal,
+  FetchAccountKeys,
+  AcquireMsalToken,
+  UpdateCopilotContext,
+  GetCopilotEnabled,
+  CheckCopilotFeatureRegistration,
+  UpdateSampleDataContext,
+  RefreshSampleData,
+  ReadDatabases,
+  ReadCollections,
+  LoadCollectionsPerDatabase,
+  RefreshNotebooksEnabled,
+  CheckPhoenixStatus,
+  CheckFeatureRegistration,
 }
 
 export const ActionModifiers = {

src/Utils/AuthorizationUtils.ts

@@ -10,7 +10,7 @@ import { DatabaseAccount } from "../Contracts/DataModels";
 import * as ViewModels from "../Contracts/ViewModels";
 import { isExpectedError } from "../Metrics/ErrorClassification";
 import { scenarioMonitor } from "../Metrics/ScenarioMonitor";
-import { trace, traceFailure } from "../Shared/Telemetry/TelemetryProcessor";
+import { trace, traceFailure, traceStart, traceSuccess } from "../Shared/Telemetry/TelemetryProcessor";
 import { UserContext, userContext } from "../UserContext";
 
 export function getAuthorizationHeader(): ViewModels.AuthorizationTokenHeaderMetadata {
@@ -74,7 +74,11 @@ export async function acquireMsalTokenForAccount(
   silent: boolean = false,
   user_hint?: string,
 ) {
+  const msalStartKey = traceStart(Action.AcquireMsalToken, {
+    acquireTokenType: silent ? "silent" : "interactive",
+  });
   if (userContext.databaseAccount.properties?.documentEndpoint === undefined) {
+    traceFailure(Action.AcquireMsalToken, { error: "No document endpoint" }, msalStartKey);
     throw new Error("Database account has no document endpoint defined");
   }
   let hrefEndpoint = "";
@@ -107,6 +111,7 @@ export async function acquireMsalTokenForAccount(
         // See https://learn.microsoft.com/en-us/entra/identity-platform/msal-js-sso#sso-between-different-apps
         try {
           const loginResponse = await msalInstance.ssoSilent(loginRequest);
+          traceSuccess(Action.AcquireMsalToken, { method: "ssoSilent" }, msalStartKey);
           return loginResponse.accessToken;
         } catch (silentError) {
           trace(Action.SignInAad, ActionModifiers.Mark, {
@@ -122,6 +127,7 @@ export async function acquireMsalTokenForAccount(
       // See https://learn.microsoft.com/en-us/entra/identity-platform/msal-js-prompt-behavior#interactive-requests-with-promptnone
       // The hint will be used to pre-fill the username field in the popup if silent is false.
       const loginResponse = await msalInstance.loginPopup({ prompt: silent ? "none" : "login", ...loginRequest });
+      traceSuccess(Action.AcquireMsalToken, { method: "loginPopup" }, msalStartKey);
       return loginResponse.accessToken;
     } catch (error) {
       traceFailure(Action.SignInAad, {
@@ -129,6 +135,7 @@ export async function acquireMsalTokenForAccount(
         acquireTokenType: silent ? "silent" : "interactive",
         errorMessage: JSON.stringify(error),
       });
+      traceFailure(Action.AcquireMsalToken, { error: JSON.stringify(error) }, msalStartKey);
       // Mark expected failure for health metrics so timeout emits healthy
       if (isExpectedError(error)) {
         scenarioMonitor.markExpectedFailure();
@@ -161,7 +168,8 @@ export async function acquireTokenWithMsal(
 
   try {
     // attempt silent acquisition first
-    return (await msalInstance.acquireTokenSilent(tokenRequest)).accessToken;
+    const token = (await msalInstance.acquireTokenSilent(tokenRequest)).accessToken;
+    return token;
   } catch (silentError) {
     if (silentError instanceof msal.InteractionRequiredAuthError && silent === false) {
       try {

src/Utils/FeatureRegistrationUtils.ts

@@ -1,6 +1,8 @@
 import { configContext } from "ConfigContext";
 import { FeatureRegistration } from "Contracts/DataModels";
 import { AuthorizationTokenHeaderMetadata } from "Contracts/ViewModels";
+import { Action } from "Shared/Telemetry/TelemetryConstants";
+import { traceFailure, traceStart, traceSuccess } from "Shared/Telemetry/TelemetryProcessor";
 import { getAuthorizationHeader } from "Utils/AuthorizationUtils";
 
 export const featureRegistered = async (subscriptionId: string, feature: string) => {
@@ -9,20 +11,27 @@ export const featureRegistered = async (subscriptionId: string, feature: string)
   const authorizationHeader: AuthorizationTokenHeaderMetadata = getAuthorizationHeader();
   const headers = { [authorizationHeader.header]: authorizationHeader.token };
 
+  const startKey = traceStart(Action.CheckFeatureRegistration, {
+    feature,
+  });
   let response;
 
   try {
     response = await _fetchWithTimeout(url, headers);
   } catch (error) {
+    traceFailure(Action.CheckFeatureRegistration, { feature, error: String(error) }, startKey);
     return false;
   }
 
   if (!response?.ok) {
+    traceFailure(Action.CheckFeatureRegistration, { feature, status: response?.status }, startKey);
     return false;
   }
 
   const featureRegistration = (await response?.json()) as FeatureRegistration;
-  return featureRegistration?.properties?.state === "Registered";
+  const registered = featureRegistration?.properties?.state === "Registered";
+  traceSuccess(Action.CheckFeatureRegistration, { feature, registered }, startKey);
+  return registered;
 };
 
 async function _fetchWithTimeout(

src/hooks/useKnockoutExplorer.ts

@@ -49,6 +49,9 @@ import {
   HostedExplorerChildFrame,
   ResourceToken,
 } from "../HostedExplorerChildFrame";
+import MetricScenario from "../Metrics/MetricEvents";
+import { ApplicationMetricPhase } from "../Metrics/ScenarioConfig";
+import { scenarioMonitor } from "../Metrics/ScenarioMonitor";
 import { emulatorAccount } from "../Platform/Emulator/emulatorAccount";
 import { parseResourceTokenConnectionString } from "../Platform/Hosted/Helpers/ResourceTokenUtils";
 import {
@@ -57,6 +60,8 @@ import {
 } from "../Platform/Hosted/HostedUtils";
 import { extractFeatures } from "../Platform/Hosted/extractFeatures";
 import { DefaultExperienceUtility } from "../Shared/DefaultExperienceUtility";
+import { Action } from "../Shared/Telemetry/TelemetryConstants";
+import { traceFailure, traceStart, traceSuccess } from "../Shared/Telemetry/TelemetryProcessor";
 import { FabricArtifactInfo, Node, PortalEnv, updateUserContext, userContext } from "../UserContext";
 import {
   acquireMsalTokenForAccount,
@@ -88,6 +93,7 @@ export function useKnockoutExplorer(platform: Platform): Explorer {
         }
 
         let explorer: Explorer;
+        try {
           if (platform === Platform.Hosted) {
             explorer = await configureHosted();
           } else if (platform === Platform.Emulator) {
@@ -97,14 +103,27 @@ export function useKnockoutExplorer(platform: Platform): Explorer {
           } else if (platform === Platform.Fabric) {
             explorer = await configureFabric();
           }
+        } catch (error) {
+          scenarioMonitor.failPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
+          throw error;
+        }
+        scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.PlatformConfigured);
+
         if (explorer && userContext.features.enableCopilot) {
           await updateContextForCopilot(explorer);
           await updateContextForSampleData(explorer);
+        } else {
+          // Explorer falsy or copilot disabled — skip deferred copilot/sampleData phases
+          scenarioMonitor.skipPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+          scenarioMonitor.skipPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
         }
 
         restoreOpenTabs();
 
+        // Complete ExplorerInitialized — React state update that unblocks ResourceTree
+        scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
         setExplorer(explorer);
+        scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.ExplorerInitialized);
       }
     };
     effect();
@@ -657,6 +676,11 @@ function configureEmulator(): Explorer {
 
 export async function fetchAndUpdateKeys(subscriptionId: string, resourceGroup: string, account: string) {
   Logger.logInfo(`Fetching keys for ${userContext.apiType} account ${account}`, "Explorer/fetchAndUpdateKeys");
+  const startKey = traceStart(Action.FetchAccountKeys, {
+    dataExplorerArea: "ResourceTree",
+    apiType: userContext.apiType,
+    accountName: account,
+  });
   let keys;
   try {
     keys = await listKeys(subscriptionId, resourceGroup, account);
@@ -664,6 +688,7 @@ export async function fetchAndUpdateKeys(subscriptionId: string, resourceGroup:
     updateUserContext({
       masterKey: keys.primaryMasterKey,
     });
+    traceSuccess(Action.FetchAccountKeys, { accountName: account }, startKey);
   } catch (error) {
     if (error.code === "AuthorizationFailed") {
       keys = await getReadOnlyKeys(subscriptionId, resourceGroup, account);
@@ -674,18 +699,23 @@ export async function fetchAndUpdateKeys(subscriptionId: string, resourceGroup:
       updateUserContext({
         masterKey: keys.primaryReadonlyMasterKey,
       });
+      traceSuccess(Action.FetchAccountKeys, { accountName: account, fallbackToReadOnly: true }, startKey);
     } else {
       logConsoleError(`Error occurred fetching keys for the account." ${error.message}`);
       Logger.logError(
         `Error during fetching keys or updating user context: ${error} for ${userContext.apiType} account ${account}`,
         "Explorer/fetchAndUpdateKeys",
       );
+      traceFailure(Action.FetchAccountKeys, { accountName: account, error: error.message }, startKey);
       throw error;
     }
   }
 }
 
 async function configurePortal(): Promise<Explorer> {
+  const configureStartKey = traceStart(Action.ConfigurePortal, {
+    dataExplorerArea: "ResourceTree",
+  });
   updateUserContext({
     authType: AuthType.AAD,
   });
@@ -800,6 +830,7 @@ async function configurePortal(): Promise<Explorer> {
           }
 
           explorer = new Explorer();
+          traceSuccess(Action.ConfigurePortal, {}, configureStartKey);
           resolve(explorer);
 
           if (openAction) {
@@ -1018,17 +1049,34 @@ interface PortalMessage {
 }
 
 async function updateContextForCopilot(explorer: Explorer): Promise<void> {
+  scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+  const startKey = traceStart(Action.UpdateCopilotContext, {
+    dataExplorerArea: "ResourceTree",
+  });
+  try {
     await explorer.configureCopilot();
+    traceSuccess(Action.UpdateCopilotContext, {}, startKey);
+  } catch (error) {
+    traceFailure(Action.UpdateCopilotContext, { error: error?.message }, startKey);
+  } finally {
+    scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.CopilotConfigured);
+  }
 }
 
 async function updateContextForSampleData(explorer: Explorer): Promise<void> {
+  scenarioMonitor.startPhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
   const copilotEnabled =
     userContext.apiType === "SQL" && userContext.features.enableCopilot && useQueryCopilot.getState().copilotEnabled;
 
   if (!copilotEnabled) {
+    scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
     return;
   }
 
+  const startKey = traceStart(Action.UpdateSampleDataContext, {
+    dataExplorerArea: "ResourceTree",
+  });
+  try {
     const url: string = createUri(configContext.PORTAL_BACKEND_ENDPOINT, "/api/sampledata");
     const authorizationHeader = getAuthorizationHeader();
     const headers = { [authorizationHeader.header]: authorizationHeader.token };
@@ -1038,6 +1086,8 @@ async function updateContextForSampleData(explorer: Explorer): Promise<void> {
     });
 
     if (!response.ok) {
+      traceSuccess(Action.UpdateSampleDataContext, { sampleDataAvailable: false }, startKey);
+      scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
       return undefined;
     }
 
@@ -1046,6 +1096,12 @@ async function updateContextForSampleData(explorer: Explorer): Promise<void> {
     updateUserContext({ sampleDataConnectionInfo });
 
     explorer.refreshSampleData();
+    traceSuccess(Action.UpdateSampleDataContext, { sampleDataAvailable: true }, startKey);
+  } catch (error) {
+    traceFailure(Action.UpdateSampleDataContext, { error: error?.message }, startKey);
+  } finally {
+    scenarioMonitor.completePhase(MetricScenario.ApplicationLoad, ApplicationMetricPhase.SampleDataLoaded);
+  }
 }
 
 interface SampledataconnectionResponse {