I have a line graph like this but I couldn't figure out how to change the legend here. I tried to modify the metadata and couldn't make it work:
If Count(*)
is a metric name, you need to go to your datasource >edit>list metrics
and add a verbose_name
with the kind of name you want to see on the legend and save. That should affect what is displayed on the legend.
Please note that this true only if the legend is metric.When it's grouped, the legend is dictated by the group by field data.