First of all, I am either inexperienced or very lucky because I have never had a flat bike tire in my life. Now comes the question.
I have a basic "Specialized Sirrus 2013" hybrid bike which has run 2500 kilometers (over 1500 miles) in various conditions. The tires are "Specialized Nimbus 700x28c". Today I accidentally noticed that the rear tire is indeed damaged:
I have no idea how long it has been like this or what is the cause (maybe a very sharp rock?). The cut/scrape is about 1 millimeter wide, 6-7 millimeter long and 3-4 millimeter deep (0.04x0.25x0.15 inches). It is clean of substantial debris but stays open like that when normally inflated at 115 Psi.
What actions should I take? The tire is not flat and I am able to ride normally but should I be concerned?