server: change hot restart parent<-->child protocol, remove stats shared memory (#5910)

Signed-off-by: Fred Douglas <fredlas@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ b6c23c5c9f3454b677ad159d7c551694ed771016

envoy/admin/v2alpha/server_info.proto

@@ -114,11 +114,9 @@ message CommandLineOptions {
   // 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;
+  // max_stats and max_obj_name_len are now unused and have no effect.
+  uint64 max_stats = 20 [deprecated = true];
+  uint64 max_obj_name_len = 21 [deprecated = true];
 
   // See :option:`--disable-hot-restart` for details.
   bool disable_hot_restart = 22;

envoy/api/v2/cds.proto

@@ -58,9 +58,6 @@ message Cluster {
   // :ref:`statistics <config_cluster_manager_cluster_stats>` if :ref:`alt_stat_name
   // <envoy_api_field_Cluster.alt_stat_name>` is not provided.
   // Any ``:`` in the cluster name will be converted to ``_`` when emitting statistics.
-  // By default, the maximum length of a cluster name is limited to 60
-  // characters. This limit can be increased by setting the
-  // :option:`--max-obj-name-len` command line argument to the desired value.
   string name = 1 [(validate.rules).string.min_bytes = 1];
 
   // An optional alternative to the cluster name to be used while emitting stats.

envoy/api/v2/lds.proto

@@ -46,9 +46,6 @@ message Listener {
   // The unique name by which this listener is known. If no name is provided,
   // Envoy will allocate an internal UUID for the listener. If the listener is to be dynamically
   // updated or removed via :ref:`LDS <config_listeners_lds>` a unique name must be provided.
-  // By default, the maximum length of a listener's name is limited to 60 characters. This limit can
-  // be increased by setting the :option:`--max-obj-name-len` command line argument to the desired
-  // value.
   string name = 1;
 
   // The address that the listener should listen on. In general, the address must be unique, though