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probably not, would be a simple glue spot, a rain sensor would have a more solid look mostly with a shiny colored sensor in the middle ...
that looks like camera lens in a hollow case ....
I'm thinking Rain sensors, maybe a sun sensor (for the automatic a/c) or combo for both. any other type of sensor there doesn't make sense. Radar cruise control (laser sensor) is usually always in front/grille. Parking sensors in front as well.... it does look strange for just a rain sensor.