Deprecated functions

[mburlic]

error in puppetserver.log

"Puppet This function is deprecated, please use stdlib::to_yaml instead. at [\"/etc/puppetlabs/code/environments/production/modules/sensu/manifests/backend.pp\", 329]:[\"/etc/puppetlabs/code/environments/production/modules/argo/manifests/mon/sensu.pp\", 48]\n (location: /etc/puppetlabs/code/environments/production/modules/stdlib/lib/puppet/functions/deprecation.rb:35:in deprecation'; /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/pops/functions/dispatch.rb:60:in invoke'; /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/pops/functions/dispatcher.rb:47:in block in dispatch'; /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/pops/functions/dispatcher.rb:46:in catch'; /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/pops/functions/dispatcher.rb:46:in dispatch'; /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/pops/functions/function.rb:43:in block in call'; /opt/puppetlabs/puppet/lib/ruby/vend

Please check code for deprecated functions.
Thank you