1、当日志量过大时候，promtail就报以下错误

rpc error: code = ResourceExhausted desc = trying to send message larger than max

2、解决方法在server下面加grpc_server_max_recv_msg_size、  grpc_server_max_send_msg_size参数，最好在Loki配置里也加一下

server:
  http_listen_port: 9080
  grpc_listen_port: 0
  grpc_server_max_recv_msg_size: 1572864000
  grpc_server_max_send_msg_size: 1572864000