fix(cost_map): label the card's loaded_at as per-worker and cover the integrity-failure fallback

tests/test_litellm/litellm_core_utils/test_get_model_cost_map.py

@@ -684,3 +684,23 @@ def test_boot_load_fallback_to_the_backup_reports_its_blob_id_and_drops_the_remo
     assert source["source"] == "local"
     assert source["etag"] is None
     assert source["source_revision"] == _bundled_blob_id()
+
+
+def test_boot_load_that_fails_the_integrity_check_reports_the_backup_not_the_rejected_fetch():
+    """A fetch that succeeds but fails integrity validation is thrown away, so the provenance must
+    describe the backup that got loaded, never the ETag or bytes of the map that was rejected."""
+    remote, _ = _mock_client(
+        [httpx.Response(200, headers={"ETag": 'W/"boot"'}, content=_real_map_bytes())], client_cls=httpx.Client
+    )
+    get_model_cost_map(url=_URL, sleep=_SyncSleepRecorder(), rng=random.Random(0), client=remote)
+    shrunk_body = b'{"gpt-5.4-mini": {"mode": "chat", "input_cost_per_token": 1e-06, "output_cost_per_token": 2e-06}}'
+    shrunk, _ = _mock_client([httpx.Response(200, headers={"ETag": 'W/"shrunk"'}, content=shrunk_body)], client_cls=httpx.Client)
+
+    get_model_cost_map(url=_URL, sleep=_SyncSleepRecorder(), rng=random.Random(0), client=shrunk)
+
+    source = get_model_cost_map_source_info()
+    assert source["source"] == "local"
+    assert source["fallback_reason"] == "Remote data failed integrity validation"
+    assert source["etag"] is None
+    assert source["source_revision"] == _bundled_blob_id()
+    assert source["source_revision"] != git_blob_id(shrunk_body)

ui/litellm-dashboard/src/components/price_data_reload.test.tsx

@@ -68,6 +68,7 @@ describe("PriceDataReload", () => {
     expect(screen.getByText("ETag:")).toBeInTheDocument();
     expect(screen.getByText('W/"eb8e9a53f4cc284b"')).toBeInTheDocument();
     expect(screen.getByText("Loaded at:")).toBeInTheDocument();
+    expect(screen.getByText(/worker that answered this request/)).toBeInTheDocument();
     expect(screen.getByText(new Date(provenance.loaded_at).toLocaleString())).toBeInTheDocument();
   });
 
@@ -91,6 +92,7 @@ describe("PriceDataReload", () => {
     expect(screen.queryByText("Source revision:")).not.toBeInTheDocument();
     expect(screen.queryByText("ETag:")).not.toBeInTheDocument();
     expect(screen.queryByText("Loaded at:")).not.toBeInTheDocument();
+    expect(screen.queryByText(/worker that answered this request/)).not.toBeInTheDocument();
   });
 
   it("confirms an immediate reload and refreshes dependent data", async () => {

ui/litellm-dashboard/src/components/price_data_reload.tsx

@@ -132,6 +132,15 @@ const CostMapProvenanceRows: React.FC<{ sourceInfo: CostMapSourceInfo }> = ({ so
         <span className="font-medium">{formatDateTime(sourceInfo.loaded_at)}</span>
       </div>
     )}
+
+    {sourceInfo.loaded_at && (
+      <div className="flex items-center gap-1.5 text-xs text-muted-foreground">
+        <Info className="size-3.5 shrink-0" />
+        <span>
+          Reported by the worker that answered this request. Other workers pick up a reload on their next poll
+        </span>
+      </div>
+    )}
   </>
 );