Support always showing legend.
Support always showing legend.

Support three states for the hideLegend graph option:
  * missing (default): show legend if fewer than 10 metrics
  * 'on': always hide the legend
  * false: always show the legend

EchoTeam/graphiti,EchoTeam/graphiti,pulseenergy/graphiti,RyWhal/graphiti,RyWhal/graphiti,pulseenergy/graphiti,RyWhal/graphiti,pulseenergy/graphiti