Milo: Handle missing / transient LogDog failures.

milo/appengine/swarming/expectations/build-running-logdog-no-annotation-stream.json

Index: milo/appengine/swarming/expectations/build-running-logdog-no-annotation-stream.json
diff --git a/milo/appengine/swarming/expectations/build-running-logdog-no-annotation-stream.json b/milo/appengine/swarming/expectations/build-running-logdog-no-annotation-stream.json
new file mode 100644
index 0000000000000000000000000000000000000000..02f382a79fe2b17277d3ea1aa80176f2493d954d
--- /dev/null
+++ b/milo/appengine/swarming/expectations/build-running-logdog-no-annotation-stream.json
@@ -0,0 +1,66 @@
+{
+  "Summary": {
+    "ParentLabel": null,
+    "Label": "1a2b3c4d5e6f7890",
+    "Status": "NotRun",
+    "Banner": null,
+    "Bot": null,
+    "Source": {
+      "Label": "Task 1a2b3c4d5e6f7890",
+      "URL": "https://example.com/user/task/1a2b3c4d5e6f7890"
+    },
+    "MainLink": null,
+    "SubLink": null,
+    "Progress": null,
+    "Started": "0001-01-01T00:00:00Z",
+    "Finished": "0001-01-01T00:00:00Z",
+    "Duration": 0,
+    "Type": "Recipe",
+    "LevelsDeep": 0,
+    "Verbosity": 0,
+    "Text": null
+  },
+  "SourceStamp": null,
+  "Components": [
+    {
+      "ParentLabel": null,
+      "Label": "Waiting...",
+      "Status": "Running",
+      "Banner": null,
+      "Bot": null,
+      "Source": null,
+      "MainLink": null,
+      "SubLink": null,
+      "Progress": null,
+      "Started": "0001-01-01T00:00:00Z",
+      "Finished": "0001-01-01T00:00:00Z",
+      "Duration": 0,
+      "Type": "Summary",
+      "LevelsDeep": 0,
+      "Verbosity": 0,
+      "Text": [
+        "waiting for annotation stream"
+      ]
+    }
+  ],
+  "PropertyGroup": [
+    {
+      "GroupName": "Swarming Tags",
+      "Property": [
+        {
+          "Key": "allow_milo",
+          "Value": "1"
+        },
+        {
+          "Key": "luci_project",
+          "Value": "testproject"
+        },
+        {
+          "Key": "log_location",
+          "Value": "logdog://example.com/testproject/${swarming_run_id}/+/annotations"
+        }
+      ]
+    }
+  ],
+  "Blame": null
+}