feature(agent-data-plane): add setting to gate registering as remote agent with Core Agent (#1091)

Author: tobz

bin/agent-data-plane/src/config.rs

@@ -9,6 +9,7 @@ pub struct DataPlaneConfiguration {
     enabled: bool,
     standalone_mode: bool,
     use_new_config_stream_endpoint: bool,
+    remote_agent_enabled: bool,
     api_listen_address: ListenAddress,
     secure_api_listen_address: ListenAddress,
     telemetry_enabled: bool,
@@ -37,6 +38,9 @@ impl DataPlaneConfiguration {
             use_new_config_stream_endpoint: config
                 .try_get_typed("data_plane.use_new_config_stream_endpoint")?
                 .unwrap_or(false),
+            remote_agent_enabled: config
+                .try_get_typed("data_plane.remote_agent_enabled")?
+                .unwrap_or(false),
             api_listen_address: config
                 .try_get_typed("data_plane.api_listen_address")?
                 .unwrap_or_else(|| ListenAddress::any_tcp(5100)),
@@ -67,6 +71,11 @@ impl DataPlaneConfiguration {
         self.use_new_config_stream_endpoint
     }
 
+    /// Returns `true` if the data plane should register as a remote agent.
+    pub const fn remote_agent_enabled(&self) -> bool {
+        self.remote_agent_enabled
+    }
+
     /// Returns a reference to the API listen address
     ///
     /// This is also referred to as the "unprivileged" API.

bin/agent-data-plane/src/internal/control_plane.rs

@@ -91,7 +91,7 @@ async fn configure_and_spawn_api_endpoints(
 ) -> Result<(), GenericError> {
     // When not in standalone mode, install the necessary components for registering ourselves with the Datadog Agent as
     // a "remote agent", which wires up ADP to allow the Datadog Agent to query it for status and flare information.
-    if !dp_config.standalone_mode() {
+    if !dp_config.standalone_mode() && dp_config.remote_agent_enabled() {
         let secure_api_grpc_target_addr =
             GrpcTargetAddress::try_from_listen_addr(dp_config.secure_api_listen_address()).ok_or_else(|| {
                 generic_error!("Failed to get valid gRPC target address from secure API listen address.")
@@ -118,6 +118,7 @@ async fn configure_and_spawn_api_endpoints(
         // Each service is tracked automatically for registration with the Remote Agent Registry.
         privileged_api = privileged_api.with_grpc_service(remote_agent_config.create_status_service());
         privileged_api = privileged_api.with_grpc_service(remote_agent_config.create_flare_service());
+
         // Only register the telemetry service if telemetry is enabled
         if dp_config.telemetry_enabled() {
             privileged_api = privileged_api.with_grpc_service(remote_agent_config.create_telemetry_service());