What's wrong with our cucumber plant?

This plant has a really nice cucumber on it, but the leaves are starting to look bad. @grow-pro has been helpful with my tomato plant issue, so I'll ask about the cucumber.

Sorry this one's out of focus a little, but you can see how big the cucumber is!
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Wide view of the various leaves with issues; close-ups after it:
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That fly is one of several extremely docile flies in the garden. They rarely move, I don't get it. Very easy to get rid of, so I'm not complaining, but -- weird!
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Thanks for your help! :)

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