Hog plum fruit look infected

JayD starts with ...
Hi there,
I'm hoping someone can help me with my hog plum tree. I think it's dwarf, only half a metre high, however bearing several fruit.
The fruit appears to have transparent sap leaking, as well as black spots that appear to be small holes.
I would like to know if this is a fungal/bacterial or insect infection, or whether this is normal for this fruit. I sliced the fruit in half, I could not find any noticeable lavae, and the holes go in only a mm through.

If it is an infestation, please let me know remedial actions.

Thank you,
Jay

Pictures - Click to enlarge
Picture: 1	Picture: 2	Picture: 3