Add server.memory_physical_bytes stats (#10156)

Signed-off-by: tianqian.zyf <tianqian.zyf@alibaba-inc.com>

Mirrored from https://github.com/envoyproxy/envoy @ 3368690e7c6bc7fd4bedf074d7ab340ad3e7f9ef

envoy/admin/v2alpha/memory.proto

@@ -11,7 +11,7 @@ option java_multiple_files = true;
 // Proto representation of the internal memory consumption of an Envoy instance. These represent
 // values extracted from an internal TCMalloc instance. For more information, see the section of the
 // docs entitled ["Generic Tcmalloc Status"](https://gperftools.github.io/gperftools/tcmalloc.html).
-// [#next-free-field: 6]
+// [#next-free-field: 7]
 message Memory {
   // The number of bytes allocated by the heap for Envoy. This is an alias for
   // `generic.current_allocated_bytes`.
@@ -34,4 +34,8 @@ message Memory {
   // The amount of memory used by the TCMalloc thread caches (for small objects). This is an alias
   // for `tcmalloc.current_total_thread_cache_bytes`.
   uint64 total_thread_cache = 5;
+
+  // The number of bytes of the physical memory usage by the allocator. This is an alias for
+  // `generic.total_physical_bytes`.
+  uint64 total_physical_bytes = 6;
 }

envoy/admin/v3/memory.proto

@@ -13,7 +13,7 @@ option java_multiple_files = true;
 // Proto representation of the internal memory consumption of an Envoy instance. These represent
 // values extracted from an internal TCMalloc instance. For more information, see the section of the
 // docs entitled ["Generic Tcmalloc Status"](https://gperftools.github.io/gperftools/tcmalloc.html).
-// [#next-free-field: 6]
+// [#next-free-field: 7]
 message Memory {
   option (udpa.annotations.versioning).previous_message_type = "envoy.admin.v2alpha.Memory";
 
@@ -38,4 +38,8 @@ message Memory {
   // The amount of memory used by the TCMalloc thread caches (for small objects). This is an alias
   // for `tcmalloc.current_total_thread_cache_bytes`.
   uint64 total_thread_cache = 5;
+
+  // The number of bytes of the physical memory usage by the allocator. This is an alias for
+  // `generic.total_physical_bytes`.
+  uint64 total_physical_bytes = 6;
 }