diff --git a/desktop/flipper-plugin-core/src/data-source/DataSource.tsx b/desktop/flipper-plugin-core/src/data-source/DataSource.tsx
index 3dd7e94bb..cb7dc2041 100644
--- a/desktop/flipper-plugin-core/src/data-source/DataSource.tsx
+++ b/desktop/flipper-plugin-core/src/data-source/DataSource.tsx
@@ -46,12 +46,23 @@ type ShiftEvent<T> = {
   entries: Entry<T>[];
   amount: number;
 };
+type SINewIndexValueEvent<T> = {
+  type: 'siNewIndexValue';
+  indexKey: string;
+  value: T;
+  firstOfKind: boolean;
+};
+type ClearEvent = {
+  type: 'clear';
+};
 
 type DataEvent<T> =
   | AppendEvent<T>
   | UpdateEvent<T>
   | RemoveEvent<T>
-  | ShiftEvent<T>;
+  | ShiftEvent<T>
+  | SINewIndexValueEvent<T>
+  | ClearEvent;
 
 type Entry<T> = {
   value: T;
@@ -181,7 +192,7 @@ export class DataSource<T extends any, KeyType = never> {
     [viewId: string]: DataSourceView<T, KeyType>;
   };
 
-  public readonly outputEventEmitter = new EventEmitter();
+  private readonly outputEventEmitter = new EventEmitter();
 
   constructor(
     keyAttribute: keyof T | undefined,
@@ -262,6 +273,10 @@ export class DataSource<T extends any, KeyType = never> {
     };
   }
 
+  public secondaryIndicesKeys(): string[] {
+    return [...this._secondaryIndices.keys()];
+  }
+
   /**
    * Returns the index of a specific key in the *records* set.
    * Returns -1 if the record wansn't found
@@ -469,6 +484,7 @@ export class DataSource<T extends any, KeyType = never> {
     this.shiftOffset = 0;
     this.idToIndex.clear();
     this.rebuild();
+    this.emitDataEvent({type: 'clear'});
   }
 
   /**
@@ -522,6 +538,16 @@ export class DataSource<T extends any, KeyType = never> {
     }
   }
 
+  public addDataListener<E extends DataEvent<T>['type']>(
+    event: E,
+    cb: (data: Extract<DataEvent<T>, {type: E}>) => void,
+  ) {
+    this.outputEventEmitter.addListener(event, cb);
+    return () => {
+      this.outputEventEmitter.removeListener(event, cb);
+    };
+  }
+
   private assertKeySet() {
     if (!this.keyAttribute) {
       throw new Error(
@@ -571,6 +597,12 @@ export class DataSource<T extends any, KeyType = never> {
       } else {
         a.push(value);
       }
+      this.emitDataEvent({
+        type: 'siNewIndexValue',
+        indexKey: indexValue,
+        value,
+        firstOfKind: !a,
+      });
     }
   }
 
@@ -631,11 +663,21 @@ export class DataSource<T extends any, KeyType = never> {
     return this.getAllRecordsByIndex(indexQuery)[0];
   }
 
+  public getAllIndexValues(index: IndexDefinition<T>) {
+    const sortedKeys = index.slice().sort();
+    const indexKey = sortedKeys.join(':');
+    const recordsByIndex = this._recordsBySecondaryIndex.get(indexKey);
+    if (!recordsByIndex) {
+      return;
+    }
+    return [...recordsByIndex.keys()];
+  }
+
   private getSecondaryIndexValueFromRecord(
     record: T,
     // assumes keys is already ordered
     keys: IndexDefinition<T>,
-  ): any {
+  ): string {
     return JSON.stringify(
       Object.fromEntries(keys.map((k) => [k, String(record[k])])),
     );
@@ -993,6 +1035,10 @@ export class DataSourceView<T, KeyType> {
         }
         break;
       }
+      case 'clear':
+      case 'siNewIndexValue': {
+        break;
+      }
       default:
         throw new Error('unknown event type');
     }
diff --git a/desktop/flipper-plugin-core/src/data-source/__tests__/datasource-basics.node.tsx b/desktop/flipper-plugin-core/src/data-source/__tests__/datasource-basics.node.tsx
index 20088bf10..0fb0a4705 100644
--- a/desktop/flipper-plugin-core/src/data-source/__tests__/datasource-basics.node.tsx
+++ b/desktop/flipper-plugin-core/src/data-source/__tests__/datasource-basics.node.tsx
@@ -912,6 +912,13 @@ test('secondary keys - lookup by single key', () => {
     indices: [['id'], ['title'], ['done']],
   });
 
+  expect(ds.secondaryIndicesKeys()).toEqual(['id', 'title', 'done']);
+  expect(ds.getAllIndexValues(['id'])).toEqual([
+    JSON.stringify({id: 'cookie'}),
+    JSON.stringify({id: 'coffee'}),
+    JSON.stringify({id: 'bug'}),
+  ]);
+
   expect(
     ds.getAllRecordsByIndex({
       title: 'eat a cookie',
@@ -938,6 +945,12 @@ test('secondary keys - lookup by single key', () => {
     }),
   ).toEqual(submitBug);
 
+  expect(ds.getAllIndexValues(['id'])).toEqual([
+    JSON.stringify({id: 'cookie'}),
+    JSON.stringify({id: 'coffee'}),
+    JSON.stringify({id: 'bug'}),
+  ]);
+
   ds.delete(0); // eat Cookie
   expect(
     ds.getAllRecordsByIndex({
@@ -945,6 +958,13 @@ test('secondary keys - lookup by single key', () => {
     }),
   ).toEqual([cookie2]);
 
+  // We do not remove empty index values (for now)
+  expect(ds.getAllIndexValues(['id'])).toEqual([
+    JSON.stringify({id: 'cookie'}),
+    JSON.stringify({id: 'coffee'}),
+    JSON.stringify({id: 'bug'}),
+  ]);
+
   // replace submit Bug
   const n = {
     id: 'bug',
@@ -972,6 +992,12 @@ test('secondary keys - lookup by single key', () => {
       title: 'eat a cookie',
     }),
   ).toEqual([cookie2]);
+
+  expect(ds.getAllIndexValues(['id'])).toEqual([
+    JSON.stringify({id: 'cookie'}),
+    JSON.stringify({id: 'coffee'}),
+    JSON.stringify({id: 'bug'}),
+  ]);
 });
 
 test('secondary keys - lookup by combined keys', () => {
@@ -983,6 +1009,13 @@ test('secondary keys - lookup by combined keys', () => {
     ],
   });
 
+  expect(ds.secondaryIndicesKeys()).toEqual(['id:title', 'done:title']);
+  expect(ds.getAllIndexValues(['id', 'title'])).toEqual([
+    JSON.stringify({id: 'cookie', title: 'eat a cookie'}),
+    JSON.stringify({id: 'coffee', title: 'drink coffee'}),
+    JSON.stringify({id: 'bug', title: 'submit a bug'}),
+  ]);
+
   expect(
     ds.getAllRecordsByIndex({
       id: 'cookie',
@@ -1014,6 +1047,13 @@ test('secondary keys - lookup by combined keys', () => {
     }),
   ).toEqual([eatCookie, cookie2]);
 
+  expect(ds.getAllIndexValues(['id', 'title'])).toEqual([
+    JSON.stringify({id: 'cookie', title: 'eat a cookie'}),
+    JSON.stringify({id: 'coffee', title: 'drink coffee'}),
+    JSON.stringify({id: 'bug', title: 'submit a bug'}),
+    JSON.stringify({id: 'cookie2', title: 'eat a cookie'}),
+  ]);
+
   const upsertedCookie = {
     id: 'cookie',
     title: 'eat a cookie',
@@ -1041,6 +1081,16 @@ test('secondary keys - lookup by combined keys', () => {
     }),
   ).toEqual(undefined);
 
+  expect(ds.getAllIndexValues(['id', 'title'])).toEqual([
+    JSON.stringify({id: 'cookie', title: 'eat a cookie'}),
+    JSON.stringify({id: 'coffee', title: 'drink coffee'}),
+    JSON.stringify({id: 'bug', title: 'submit a bug'}),
+    JSON.stringify({id: 'cookie2', title: 'eat a cookie'}),
+  ]);
+
+  const clearSub = jest.fn();
+  ds.addDataListener('clear', clearSub);
+
   ds.clear();
   expect(
     ds.getAllRecordsByIndex({
@@ -1049,6 +1099,12 @@ test('secondary keys - lookup by combined keys', () => {
     }),
   ).toEqual([]);
 
+  expect(ds.getAllIndexValues(['id', 'title'])).toEqual([]);
+  expect(clearSub).toBeCalledTimes(1);
+
+  const newIndexValueSub = jest.fn();
+  ds.addDataListener('siNewIndexValue', newIndexValueSub);
+
   ds.append(cookie2);
   expect(
     ds.getAllRecordsByIndex({
@@ -1056,4 +1112,23 @@ test('secondary keys - lookup by combined keys', () => {
       title: 'eat a cookie',
     }),
   ).toEqual([cookie2]);
+
+  expect(ds.getAllIndexValues(['id', 'title'])).toEqual([
+    JSON.stringify({id: 'cookie2', title: 'eat a cookie'}),
+  ]);
+
+  // Because we have 2 indecies
+  expect(newIndexValueSub).toBeCalledTimes(2);
+  expect(newIndexValueSub).toBeCalledWith({
+    type: 'siNewIndexValue',
+    indexKey: JSON.stringify({id: 'cookie2', title: 'eat a cookie'}),
+    firstOfKind: true,
+    value: cookie2,
+  });
+  expect(newIndexValueSub).toBeCalledWith({
+    type: 'siNewIndexValue',
+    indexKey: JSON.stringify({done: 'true', title: 'eat a cookie'}),
+    firstOfKind: true,
+    value: cookie2,
+  });
 });