admin: display command line options in server info end point (#5015)

Signed-off-by: Rama <rama.rao@salesforce.com>

Mirrored from https://github.com/envoyproxy/envoy @ 1623901e0a86cc8b474492ce44c0b86df7989ea9

envoy/admin/v2alpha/server_info.proto

@@ -24,8 +24,100 @@ message ServerInfo {
 
   // Uptime since current epoch was started.
   google.protobuf.Duration uptime_current_epoch = 3;
+
   // Uptime since the start of the first epoch.
   google.protobuf.Duration uptime_all_epochs = 4;
-  // Which restart epoch the server is currently in.
-  uint32 epoch = 5;
+
+  // Command line options the server is currently running with.
+  CommandLineOptions command_line_options = 6;
+}
+
+message CommandLineOptions {
+  // See :option:`--base-id` for details.
+  uint64 base_id = 1;
+
+  // See :option:`--concurrency` for details.
+  uint32 concurrency = 2;
+
+  // See :option:`--config-path` for details.
+  string config_path = 3;
+
+  // See :option:`--config-yaml` for details.
+  string config_yaml = 4;
+
+  // See :option:`--allow-unknown-fields` for details.
+  bool allow_unknown_fields = 5;
+
+  // See :option:`--admin-address-path` for details.
+  string admin_address_path = 6;
+
+  enum IpVersion {
+    v4 = 0;
+    v6 = 1;
+  }
+
+  // See :option:`--local-address-ip-version` for details.
+  IpVersion local_address_ip_version = 7;
+
+  // See :option:`--log-level` for details.
+  string log_level = 8;
+
+  // See :option:`--component-log-level` for details.
+  string component_log_level = 9;
+
+  // See :option:`--log-format` for details.
+  string log_format = 10;
+
+  // See :option:`--log-path` for details.
+  string log_path = 11;
+
+  // See :option:`--hot-restart-version` for details.
+  bool hot_restart_version = 12;
+
+  // See :option:`--service-cluster` for details.
+  string service_cluster = 13;
+
+  // See :option:`--service-node` for details.
+  string service_node = 14;
+
+  // See :option:`--service-zone` for details.
+  string service_zone = 15;
+
+  // See :option:`--file-flush-interval-msec` for details.
+  google.protobuf.Duration file_flush_interval = 16;
+
+  // See :option:`--drain-time-s` for details.
+  google.protobuf.Duration drain_time = 17;
+
+  // See :option:`--parent-shutdown-time-s` for details.
+  google.protobuf.Duration parent_shutdown_time = 18;
+
+  enum Mode {
+    // Validate configs and then serve traffic normally.
+    Serve = 0;
+
+    // Validate configs and exit.
+    Validate = 1;
+
+    // Completely load and initialize the config, and then exit without running the listener loop.
+    InitOnly = 2;
+  }
+
+  // See :option:`--mode` for details.
+  Mode mode = 19;
+
+  // See :option:`--max-stats` for details.
+  uint64 max_stats = 20;
+
+  // See :option:`--max-obj-name-len` for details.
+  uint64 max_obj_name_len = 21;
+
+  // See :option:`--disable-hot-restart` for details.
+  bool disable_hot_restart = 22;
+
+  // See :option:`--enable-mutex-tracing` for details.
+  bool enable_mutex_tracing = 23;
+
+  // See :option:`--restart-epoch` for details.
+  uint32 restart_epoch = 24;
 }