Picture from here

What's the shiny, slightly curved triangular plate with rails above it?

enter image description here

A larger version, cropped from here, thanks to a comment by ohsin.

enter image description here

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    $\begingroup$ @OrganicMarble so it seems that the 2011 post-drilling vacuum patch held? $\endgroup$ – uhoh Feb 13 '19 at 1:40
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    $\begingroup$ A better image(Progress 68) commons.wikimedia.org/wiki/… It was present in 2000 spaceflight.nasa.gov/gallery/images/station/progress/html/… $\endgroup$ – Ohsin Feb 13 '19 at 5:26
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    $\begingroup$ A close up of Ohsin's image suggests it is an antenna. $\endgroup$ – user20636 Feb 13 '19 at 9:03
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    $\begingroup$ Thermal exhaust port. For we all know what happens when you leave it open. $\endgroup$ – void_ptr Feb 13 '19 at 18:40
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    $\begingroup$ Same feature can be seen here on departing propulsion module (Progress-M derived) that delivered Poisk to ISS commons.wikimedia.org/wiki/… $\endgroup$ – Ohsin Sep 1 '20 at 23:50

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