If you look at by channel metrics there are pretty colours (!) but its not possible to distinguish what the channel names are because the names are too long.
Any chance that either the popup be enlarged to accommodate the channel name length … or left ellipsize the text instead of right?
In general I agree this shouldn’t be ellipting (ellipting on the left would help in this case, but not in general). All the things that make up a channel have (or should have / will have soon) a maximum length, so just letting the popup show the whole thing should work.
In particular in this case, the branch in those channels (that is the bit after
stable/) should match the ubuntu release.
You might want to file a bug against the storefront. There’s a link at the bottom of the page those metrics are displayed on.