Return resource count from ListXXX calls

backend/README.md

@@ -3,7 +3,7 @@ Pipelines backend.
 
 ## Building & Testing
 All components can be built using [Bazel](https://bazel.build/). To build
-everything under bazel, run:
+everything under backend, run:
 ```
 bazel build //backend/...
 ```
@@ -13,6 +13,11 @@ To run all tests:
 bazel test //backend/...
 ```
 
+## Building Go client library and swagger files
+After making changes to proto files, the Go client libraries and swagger
+files need to be regenerated and checked-in. The backend/api/generate_api.sh
+script takes care of this.
+
 ## Updating BUILD files
 As the backend is written in Go, the BUILD files can be updated automatically
 using [Gazelle](https://github.com/bazelbuild/bazel-gazelle). Whenever a Go
@@ -27,4 +32,4 @@ bumped in the `go.mod` file, ensure the BUILD files pick this up by updating
 the WORKSPACE go_repository rules using the following command:
 ```
 bazel run //:gazelle -- update-repos --from_file=go.mod
-```
+```

backend/api/experiment.proto

@@ -105,6 +105,7 @@ message ListExperimentsRequest {
 
 message ListExperimentsResponse {
   repeated Experiment experiments = 1;
+  int32 total_size = 3;
   string next_page_token = 2;
 }