[openstreetmap/openstreetmap-website] Map tiles are not updating? (#2095)

[Tom Hughes]

For performance reasons we use a simplified algorithm for tile dirtying which (as you have guessed) means that updates which only change a relation do not cause tiles to be rerendered.

This is deliberate, to stop changes to large boundary relations having to dirty, and then rerender, very large numbers of tiles.

As you've also guessed it's really anything to do with this repository - the actual code is https://github.com/openstreetmap/chef/blob/master/cookbooks/tile/files/default/bin/expire-tiles-single#L18.

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