What is the word for something that has been covered in a lot of sources?

I'm looking for a word or phrase that describes when a topic has been subject to a preponderance of in-depth coverage, similar to "well-trodden" but more fitting. I'd like to avoid any kind of moralizing language like "trite" or "notable/important" in terms of how it's been covered—at most, it would be acceptable to say that the subject has been adequately covered—but I'd like the connotation to be just that it has been covered in a lot of sources.

Sample sentences:

We can say that issue of the tampon tax is [well-covered] now that dozens of journalists have written about it.

I can write her biography now that her life has been [well-covered in sources].

Well-documented may fit in the context:

• based on or supported with a lot of written evidence.

MacMillan Dictionary

More colloquially, it's been "done to death". According to the Cambridge Idioms Dictionary:

if a particular style or subject is done to death, it is used or discussed so many times that it is not interesting any more

To place the emphasis on the notion that the matter has been discussed in great depth and breadth, you could use the following phrase:

discussed/covered extensively

extensive (Merriam Webster)

having wide or considerable extent

extensive (Cambridge Dictionary)

covering a large area; having a great range