Add vm_memory_calculation_strategy to rabbitmq.conf.example

Author: michaelklishin

docs/rabbitmq.conf.example

@@ -267,6 +267,11 @@
 ##
 # vm_memory_high_watermark_paging_ratio = 0.5
 
+## Selects Erlang VM memory consumption calculation strategy. Can be `rss` or `erlang`,
+## `rss` is the default. Introduced in 3.6.11.
+## See https://github.com/rabbitmq/rabbitmq-server/issues/1223 for background.
+# vm_memory_calculation_strategy = rss
+
 ## Interval (in milliseconds) at which we perform the check of the memory
 ## levels against the watermarks.
 ##