It was only 'documented' by Pliny the Younger quite some years in letters to Tacitus commemorating Pliny's father. These were written about 30 years after the event but are the sole eyewitness accounts. That's the sole real piece of documentation that exists for the eruptions. Seutonius mentions that Emperor Titus helped some of the inhabitants (about 1 short paragraph), which Dio Cassius more or less replicated to the same length, but that's the extent of how the Roman government reacted. Dio Cassius also has a much more dramatized account of the event, which he essentially made up. Tacitus has a vague reference to general destruction in Italy at this time.

There's a vague reference by Domitian's court poet, Statius, to Vesuvius, but without specifically mentioning any particular town (1 sentence), a slightly longer piece of poetry which again, mentions very few specifics beyond Vesuvius erupting, and another couple of lines tangentially referencing Vesuvius. Martial's epigram 4.44 simply mentions (somewhat poetically) that the lovely green areas around the area are now submerged under 'flames and sad ashes'. There's more vague references (about 1 sentence each) about volcanic eruptions like Vesuvius in Valerius Flaccus and Silius Italicus. Josephus makes a passing 1 sentence reference to how someone was killed in the eruption, which is probably the only mention of someone by name who died there.

Everything else comes at least a century afterwards. Again, mostly short sentences or the odd paragraph - Marcus Aurelius, the Sibylline Oracles, Tertullian, Plutarch, Eusebius, but these are primarily theological takes on the disaster.

In short, you could fit all the actual 'historical' (including eyewitness) accounts in about 4 sides of an A4 sheet, the majority of which would be Pliny's account. That's all.