Merge request diffs sometimes return 500
https://sentry.gitlab.net/gitlab/gitlabcom/issues/1226184/
Redis::CommandError: ERR unknown command 'memory'
redis/client.rb:126:in `call'
raise reply if reply.is_a?(CommandError)
peek/views/redis_detailed.rb:10:in `call'
super(*args, &block)
redis.rb:3311:in `block in method_missing'
client.call([command] + args)
redis.rb:52:in `block in synchronize'
mon_synchronize { yield(@client) }
monitor.rb:235:in `mon_synchronize'
yield
...
(151 additional frame(s) were not displayed)
Redis::CommandError: ERR unknown command 'memory'
Edited by Heinrich Lee Yu