title: How to retrieve statement metrics from postgres using metricbeat
body: <p>I am seeing database,bgwriter,activity metrics in kibana, 
  but not statement metrics, do we have to change the postgres.conf to retrieve 
  statement metrics</p>
  
  <pre><code>metricbeat.yml - 
  - module: postgresql
    enabled: true
    metricsets:
        - database
        - bgwriter
        - activity
        - statement
  </code></pre>