lass="ruby-identifier">params</span>[<span class="ruby-value">:time_slab</span>])
  <span class="ruby-identifier">app_id</span> = <span class="ruby-identifier">params</span>[<span class="ruby-value">:id</span>]
  <span class="ruby-identifier">wall_time</span>, <span class="ruby-identifier">db_time</span>, <span class="ruby-identifier">max</span>, <span class="ruby-identifier">slab</span>, <span class="ruby-identifier">step</span> = <span class="ruby-constant">AppTimeSample</span>.<span class="ruby-identifie