news: add news entry

Signed-off-by: Attila Szakacs <[email protected]>

Author: alltilla

news/feature-5266.md

@@ -0,0 +1,22 @@
+`google-pubsub-grpc()`: Added a new destination that sends logs to Google Pub/Sub via the gRPC interface.
+
+Example config:
+```
+google-pubsub-grpc(
+  project("my_project")
+  topic($topic)
+
+  data($MESSAGE)
+  attributes(
+    timestamp => $S_ISODATE,
+    host => $HOST,
+  )
+
+  workers(4)
+  batch-timeout(1000) # ms
+  batch-lines(1000)
+);
+```
+
+The `project()` and `topic()` options are templatable.
+The default service endpoint can be changed with the `service_endpoint()` option.