I've added a chart page to display any outages, as well as the daily volume of tracks, and any backfill that has taken place.

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The red line at the bottom is the volume of backfill tracks. It's quite revealing, I think, in terms of how inaccurate the data in https://www.bbc.co.uk/music/tracks/find/6music can be, and how many tracks we were missing prior to implementing the backfill.