Pretty graphs for slow gauges

I’ve got a gauge representing a total size of a directory tree with many files.
This doesn’t change very quickly, it’s just something I want to keep an eye on. I don’t want to spend more time counting files than I have to, so the gauge updates every hour and is scraped every 30 minutes.

Thing is this results in an ugly graph with lots of missing data because the metric is mostly stale. Is there a way to convince grafana to draw a pretty line between my points anyway?

Can you explain further (or show us) how your gauge visualization looks? Perhaps you were referring to a time series visualization?