ServiceInfosBuilder addEndpoint(io.grpc.MethodDescriptor<?, ?> grpcMethod, EndpointInfo endpointInfo) {
            final ServiceDescriptor service = services.get(grpcMethod.getServiceName());
            assert service != null;

            final MethodDescriptor method =
                    service.findMethodByName(grpcMethod.getBareMethodName());
            assert method != null;

            methods.put(service, method);
            endpoints.put(method, endpointInfo);
            return this;
        }
{@link DocServicePlugin} implementation that supports {@link GrpcService}s.
grpc/src/main/java/com/linecorp/armeria/internal/server/grpc/GrpcDocServicePlugin.java