fix names and updated documentation

.chloggen/load-balancer-round-robin.yaml

@@ -12,6 +12,11 @@ note: Update the default load balancer strategy to round_robin
 # One or more tracking issues or pull requests related to the change
 issues: [10319]
 
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: To restore the behavior that was previously the default, set `balancer_name` to `pick_first`.
+
 # Optional: The change log or logs in which this entry should be included.
 # e.g. '[user]' or '[user, api]'
 # Include 'user' if the change is relevant to end users.

config/configgrpc/README.md

@@ -15,8 +15,8 @@ configuration parameters are also defined under `tls` like server
 configuration. For more information, see [configtls
 README](../configtls/README.md).
 
-- [`balancer_name`](https://github.com/grpc/grpc-go/blob/master/examples/features/load_balancing/README.md)
-- `compression` Compression type to use among `gzip`, `snappy`, `zstd`, and `none`.
+- [`balancer_name`](https://github.com/grpc/grpc-go/blob/master/examples/features/load_balancing/README.md): Default before v0.103.0 is `pick_first`, default for v0.103.0 is `round_robin`. See [issue](https://github.com/open-telemetry/opentelemetry-collector/issues/10298). To restore the previous behavior, set `balancer_name` to `pick_first`.
+- `compression`: Compression type to use among `gzip`, `snappy`, `zstd`, and `none`.
 - `endpoint`: Valid value syntax available [here](https://github.com/grpc/grpc/blob/master/doc/naming.md)
 - [`tls`](../configtls/README.md)
 - `headers`: name/value pairs added to the request

config/configgrpc/configgrpc.go

@@ -55,8 +55,8 @@ func NewDefaultKeepaliveClientConfig() *KeepaliveClientConfig {
 	}
 }
 
-// NewDefaultBalancernameClientConfig returns a new instance of BalancernameClientConfig with default values.
-func NewDefaultBalancernameClientConfig() string {
+// BalancerName returns a string with default load balancer value
+func BalancerName() string {
 	return "round_robin"
 }
 
@@ -110,7 +110,7 @@ func NewDefaultClientConfig() *ClientConfig {
 		TLSSetting:   configtls.NewDefaultClientConfig(),
 		Keepalive:    NewDefaultKeepaliveClientConfig(),
 		Auth:         configauth.NewDefaultAuthentication(),
-		BalancerName: NewDefaultBalancernameClientConfig(),
+		BalancerName: BalancerName(),
 	}
 }
 

config/configgrpc/configgrpc_test.go

@@ -49,7 +49,7 @@ func TestNewDefaultClientConfig(t *testing.T) {
 		TLSSetting:   configtls.NewDefaultClientConfig(),
 		Keepalive:    NewDefaultKeepaliveClientConfig(),
 		Auth:         configauth.NewDefaultAuthentication(),
-		BalancerName: NewDefaultBalancernameClientConfig(),
+		BalancerName: BalancerName(),
 	}
 
 	result := NewDefaultClientConfig()