RRD4J charts missing labels

Number  Master_Voltage  "Master BD Volts    [%.2f V]"   <electric> { mqtt channel }
 Chart item=Master_Voltage period=D refresh=300

resulting chart is missing the label. i used to have labels on all my charts. recently upgraded to 2.2.0 and now no labels on any charts. they otherwise appear to be working fine

oddly, if i generate the chart this way, it’s fine. its the sitemap that’s ignoring it for some reason?

Yet another thing that changed during the transition to 2.2.0
see: https://docs.openhab.org/configuration/sitemaps.html#element-type-chart

append legend=true (or false) to your chart line:

Chart item=Master_Temperature period=4h refresh=300 legend=true
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