[Tile-serving] [osm2pgsql-dev/osm2pgsql] Allow a limit to be set on expiry of line segments (PR #2185)

[Tom Hughes]

We are now expiring at the metatile level, yes.

The idea of the length limit was really twofold, to reduce the amount of time we spent re-rendering tiles and to reduce the visibility of the damage. I was kind of thinking that we wouldn't then need to do a global dirty after the revert but I guess that we probably would as you say.

I don't think we've really had an incident that allows to test the effectiveness of either change though.

Maybe we should drop this for now and see how things go with the other change - at least then the revert should correctly dirty the tiles that are changed avoiding the need for a global dirty.

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