As I recall, small cracks in concrete pads (patios, lanais, driveways, pool decks, etc.) are not covered by home warranty, and as stated above are a normal occurrence. I agree that a patch in a tube is probably the best "fix". I also agree that is may not be a permanent fix. The crack appeared because there was some movement between different areas of the pad or pad and structure. If I were going to do this, I would try a flexible (silicone) based crack filling material. I have seen these in various colors, so with some luck you should be able to get close to your concrete color.
NOTE: no 2 concrete pours ever come up the same color, so if you go for an actual concrete patch material that you mix with water and apply, you will have a significant color difference.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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