Remote server log production.log is empty - ruby-on-rails

Question

Issue: log/production.rb file exists but is empty on production Rails 4.2 environment.
App root and permissions:
drwxrwxr-x 2 deploy deploy 4096 Mar 7 14:59 .
drwxrwxr-x 21 deploy deploy 4096 Mar 7 04:16 ..
-rw-rw-r-- 1 deploy deploy 0 Feb 6 17:13 .git_keep
-rw-rw-r-- 1 deploy deploy 95833941 Mar 9 05:16 newrelic_agent.log
-rwxrwxrwx 1 deploy deploy 80 Mar 9 01:16 production.log
-rw------- 1 deploy deploy 129287 Mar 7 08:24 production.searchd.log
-rw------- 1 deploy deploy 93957 Mar 9 05:06 production.searchd.query.log
-rw------- 1 deploy deploy 5 Feb 7 10:37 production.sphinx.pid
config/environments/production.rb
# If you have no front-end server that supports something like X-Sendfile,
# just comment this out and Rails will serve the files
config.log_level = :info
# Basic log config, for calls to Rails.logger.<level> { <message> }
config.logger = Logger.new('log/production.log')
# Formats log entries into: LEVEL MESSAGE
# Heroku adds to this timestamp and worker/dyno id, so datetime can be stripped
config.logger.formatter = ->(severity, datetime, progname, msg) { "#{severity} #{msg}\n" }
# Lograge config, overrides default instrumentation for logging ActionController and ActionView logging
config.lograge.enabled = true
Help please. Thank you for advance