fix(profiling): Query spans instead of discover on landing page

Searching transactions is going away as we move away from transactions as the
SDK's transport for spans. On the Explore Profiles landing page's transactions
table, query the `spans` dataset with an extra `is_transaction:true` clause
instead of the deprecated `discover` (behind the scenes: `transactions`)
dataset.

Author: mjq

static/app/utils/profiling/hooks/useProfileEvents.spec.tsx

@@ -26,8 +26,9 @@ describe('useProfileEvents', () => {
       body,
       match: [
         MockApiClient.matchQuery({
-          dataset: 'discover',
-          query: '(has:profile.id OR (has:profiler.id has:thread.id)) (transaction:foo)',
+          dataset: 'spans',
+          query:
+            'is_transaction:true (has:profile.id OR (has:profiler.id has:thread.id)) (transaction:foo)',
         }),
       ],
     });
@@ -54,7 +55,7 @@ describe('useProfileEvents', () => {
       url: `/organizations/${organization.slug}/events/`,
       status: 400,
       statusCode: 400,
-      match: [MockApiClient.matchQuery({dataset: 'discover'})],
+      match: [MockApiClient.matchQuery({dataset: 'spans'})],
     });
 
     const {result} = renderHookWithProviders(useProfileEvents, {

static/app/utils/profiling/hooks/useProfileEvents.tsx

@@ -35,11 +35,11 @@ export function useProfileEvents<F extends string>({
   const organization = useOrganization();
   const {selection} = usePageFilters();
 
-  query = `(has:profile.id OR (has:profiler.id has:thread.id)) ${query ? `(${query})` : ''}`;
+  query = `is_transaction:true (has:profile.id OR (has:profiler.id has:thread.id)) ${query ? `(${query})` : ''}`;
 
   const endpointOptions = {
     query: {
-      dataset: 'discover',
+      dataset: 'spans',
       referrer,
       project: projects || selection.projects,
       environment: selection.environments,

static/app/views/profiling/content.tsx

@@ -397,7 +397,6 @@ function ProfilingContentPageHeader() {
 const ALL_FIELDS = [
   'transaction',
   'project.id',
-  'last_seen()',
   'p50()',
   'p75()',
   'p95()',

static/app/views/profiling/profileSummary/profileSummaryPage.spec.tsx

@@ -51,7 +51,7 @@ describe('ProfileSummaryPage', () => {
     MockApiClient.addMockResponse({
       url: `/organizations/${organization.slug}/events/`,
       body: {
-        data: [{'last_seen()': new Date()}],
+        data: [{transaction: '/test'}],
       },
     });