chore: Remove graduated feature flag performance-mep-bannerless-ui (#111147)

This flag is fully rolled out. Remove the flag registration and simplify
all gated code paths: MEP banners, indexed events warnings, and metrics
cardinality threshold checks now use the graduated behavior directly.

<!-- Describe your PR here. -->

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Dan Fuller <danfuller@H3FG21463J.local>

Author: 3 people

src/sentry/features/temporary.py

@@ -223,8 +223,6 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:performance-issues-search", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, default=True, api_expose=False)
     # Detect performance issues in the new standalone spans pipeline instead of on transactions
     manager.add("organizations:performance-issues-spans", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, default=False, api_expose=False)
-    # Enable internal view for bannerless MEP view
-    manager.add("organizations:performance-mep-bannerless-ui", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Re-enable histograms for Metrics Enhanced Performance Views
     manager.add("organizations:performance-mep-reintroduce-histograms", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable MongoDB support for the Queries module

static/app/components/modals/dashboardWidgetQuerySelectorModal.tsx

@@ -23,7 +23,6 @@ export type DashboardWidgetQuerySelectorModalOptions = {
   dashboardFilters: DashboardFilters | undefined;
   organization: Organization;
   widget: Widget;
-  isMetricsData?: boolean;
 };
 
 type Props = ModalRenderProps &
@@ -34,8 +33,7 @@ type Props = ModalRenderProps &
   };
 
 function DashboardWidgetQuerySelectorModal(props: Props) {
-  const {organization, widget, selection, isMetricsData, Body, Header, dashboardFilters} =
-    props;
+  const {organization, widget, selection, Body, Header, dashboardFilters} = props;
 
   const renderQueries = () => {
     const querySearchBars = widget.queries.map((query, index) => {
@@ -46,9 +44,7 @@ function DashboardWidgetQuerySelectorModal(props: Props) {
         },
         dashboardFilters,
         selection,
-        organization,
-        0,
-        isMetricsData
+        organization
       );
       return (
         <Fragment key={index}>

static/app/components/modals/dataWidgetViewerModal.tsx

@@ -98,10 +98,7 @@ import {
   SESSION_DURATION_ALERT,
   WidgetDescription,
 } from 'sentry/views/dashboards/widgetCard';
-import {
-  DashboardsMEPProvider,
-  useDashboardsMEPContext,
-} from 'sentry/views/dashboards/widgetCard/dashboardsMEPContext';
+import {DashboardsMEPProvider} from 'sentry/views/dashboards/widgetCard/dashboardsMEPContext';
 import type {GenericWidgetQueriesResult} from 'sentry/views/dashboards/widgetCard/genericWidgetQueries';
 import {IssueWidgetQueries} from 'sentry/views/dashboards/widgetCard/issueWidgetQueries';
 import {ReleaseWidgetQueries} from 'sentry/views/dashboards/widgetCard/releaseWidgetQueries';
@@ -907,8 +904,6 @@ function OpenButton({
 }: OpenButtonProps) {
   let openLabel: string;
   let path: string;
-  const {isMetricsData} = useDashboardsMEPContext();
-
   switch (widget.widgetType) {
     case WidgetType.ISSUE:
       openLabel = t('Open in Issues');
@@ -940,9 +935,7 @@ function OpenButton({
         {...widget, queries: [widget.queries[selectedQueryIndex]!]},
         dashboardFilters,
         selection,
-        organization,
-        0,
-        isMetricsData
+        organization
       );
       break;
   }

static/app/components/modals/widgetBuilder/addToDashboardModal.tsx

@@ -33,7 +33,6 @@ import {useApi} from 'sentry/utils/useApi';
 import {useNavigate} from 'sentry/utils/useNavigate';
 import {useParams} from 'sentry/utils/useParams';
 import {DashboardCreateLimitWrapper} from 'sentry/views/dashboards/createLimitWrapper';
-import {IndexedEventsSelectionAlert} from 'sentry/views/dashboards/indexedEventsSelectionAlert';
 import {
   assignDefaultLayout,
   assignTempId,
@@ -539,7 +538,6 @@ function AddToDashboardModal({
                         disableTableActions
                       />
                     </WidgetCardWrapper>
-                    <IndexedEventsSelectionAlert widget={widget} />
                   </MEPSettingProvider>
                 </DashboardsMEPProvider>
               )}

static/app/utils/performance/contexts/metricsCardinality.tsx

@@ -112,8 +112,7 @@ export function MetricsCardinalityProvider(props: {
                             ...sumsResult.tableData,
                           }
                         : null,
-                      !!compatabilityResult.error && !!sumsResult.error,
-                      props.organization
+                      !!compatabilityResult.error && !!sumsResult.error
                     );
 
               return (
@@ -173,18 +172,14 @@ export const useMetricsCardinalityContext = _useContext;
  */
 function getMetricsOutcome(
   dataCounts: MergedMetricsData | null,
-  hasOtherFallbackCondition: boolean,
-  organization: Organization
+  hasOtherFallbackCondition: boolean
 ) {
   const fallbackOutcome: MetricDataSwitcherOutcome = {
     forceTransactionsOnly: true,
   };
   const successOutcome: MetricDataSwitcherOutcome = {
     forceTransactionsOnly: false,
   };
-  const isOnFallbackThresolds = organization.features.includes(
-    'performance-mep-bannerless-ui'
-  );
 
   if (!dataCounts) {
     return fallbackOutcome;
@@ -195,15 +190,11 @@ function getMetricsOutcome(
     return fallbackOutcome;
   }
 
-  if (!dataCounts) {
-    return fallbackOutcome;
-  }
-
   if (checkNoDataFallback(dataCounts)) {
     return fallbackOutcome;
   }
 
-  if (checkIncompatibleData(dataCounts, isOnFallbackThresolds)) {
+  if (checkIncompatibleData(dataCounts)) {
     return {
       shouldWarnIncompatibleSDK: true,
       forceTransactionsOnly: true,
@@ -219,7 +210,7 @@ function getMetricsOutcome(
     };
   }
 
-  if (checkIfPartialOtherData(dataCounts, isOnFallbackThresolds)) {
+  if (checkIfPartialOtherData(dataCounts)) {
     return {
       shouldNotifyUnnamedTransactions: true,
       compatibleProjects,
@@ -241,16 +232,10 @@ function checkNoDataFallback(dataCounts: MergedMetricsData) {
 /**
  * Fallback and warn if incompatible data found (old specific SDKs).
  */
-function checkIncompatibleData(
-  dataCounts: MergedMetricsData,
-  isOnFallbackThresolds: boolean
-) {
+function checkIncompatibleData(dataCounts: MergedMetricsData) {
   const counts = normalizeCounts(dataCounts);
-  if (isOnFallbackThresolds) {
-    const ratio = counts.nullCount / counts.metricsCount;
-    return ratio > NULL_THRESHOLD;
-  }
-  return counts.nullCount > 0;
+  const ratio = counts.nullCount / counts.metricsCount;
+  return ratio > NULL_THRESHOLD;
 }
 
 /**
@@ -264,16 +249,10 @@ function checkIfAllOtherData(dataCounts: MergedMetricsData) {
 /**
  * Show metrics but warn about unnamed transactions.
  */
-function checkIfPartialOtherData(
-  dataCounts: MergedMetricsData,
-  isOnFallbackThresolds: boolean
-) {
+function checkIfPartialOtherData(dataCounts: MergedMetricsData) {
   const counts = normalizeCounts(dataCounts);
-  if (isOnFallbackThresolds) {
-    const ratio = counts.unparamCount / counts.metricsCount;
-    return ratio > UNPARAM_THRESHOLD;
-  }
-  return counts.unparamCount > 0;
+  const ratio = counts.unparamCount / counts.metricsCount;
+  return ratio > UNPARAM_THRESHOLD;
 }
 
 /**

static/app/views/dashboards/detail.tsx

@@ -66,7 +66,6 @@ import {
   getCurrentPageFilters,
   getMergedDashboardFilters,
   hasUnsavedFilterChanges,
-  isWidgetUsingTransactionName,
   resetPageFilters,
 } from 'sentry/views/dashboards/utils';
 import {WidgetQueryQueueProvider} from 'sentry/views/dashboards/utils/widgetQueryQueue';
@@ -83,8 +82,6 @@ import {TopBar} from 'sentry/views/navigation/topBar';
 import {useHasPageFrameFeature} from 'sentry/views/navigation/useHasPageFrameFeature';
 import {generatePerformanceEventView} from 'sentry/views/performance/data';
 import {MetricsDataSwitcher} from 'sentry/views/performance/landing/metricsDataSwitcher';
-import {MetricsDataSwitcherAlert} from 'sentry/views/performance/landing/metricsDataSwitcherAlert';
-import {DiscoverQueryPageSource} from 'sentry/views/performance/utils';
 
 import {PrebuiltDashboardOnboardingGate} from './components/prebuiltDashboardOnboardingGate';
 import {Controls} from './controls';
@@ -1176,10 +1173,6 @@ class DashboardDetail extends Component<Props, State> {
 
     const eventView = generatePerformanceEventView(location, projects, {});
 
-    const isDashboardUsingTransaction = dashboard.widgets.some(
-      isWidgetUsingTransactionName
-    );
-
     const pageContent = (
       <Stack flex={1}>
         <OnDemandControlProvider location={location}>
@@ -1263,15 +1256,6 @@ class DashboardDetail extends Component<Props, State> {
                           location={location}
                           forceTransactions={metricsDataSide.forceTransactionsOnly}
                         >
-                          {isDashboardUsingTransaction ? (
-                            <MetricsDataSwitcherAlert
-                              organization={organization}
-                              eventView={eventView}
-                              projects={projects}
-                              source={DiscoverQueryPageSource.DISCOVER}
-                              {...metricsDataSide}
-                            />
-                          ) : null}
                           <FiltersBar
                             dashboard={modifiedDashboard ?? dashboard}
                             filters={(modifiedDashboard ?? dashboard).filters}