system-config/modules/log_processor/templates/jenkins-log-client.default.erb

<% if scope.lookupvar("log_processor::client::statsd_host") != "" %>
export STATSD_HOST=<%= scope.lookupvar("log_processor::client::statsd_host") %>
export STATSD_PORT=8125
export STATSD_PREFIX="logstash.geard"
<% end %>