If something was a long time ago, just summarize it and keep it short and sweet. Nobody needs to read 8 bullet points on an internship you had 7 gigs ago which has no relevance to the job you're applying for. Contractors are particularly bad offenders here in my experience. No hiring manager will read through a 13 page resume for somebody with 6 years experience. As the TFA mentions, use that valuable space to highlight more recent, relevant experience and put your best foot forward. Everything else is just noise.
The first bullet point for each one of those is:
* Followed the Software Development Lifecycle
The second bullet point is:
* Attended all required meetings and ceremonies for agile scrum
At the end of each contract is two lines of technologies used in the environment (though not necessarily by the candidate). For example, kuberentes will certainly be on that list. When asked about helm or kustomize or kubectl: "Oh, the build put an image out on docker hub and then the operations team did all the work to deploy it."
If you've got a CV hosted somewhere with CMS and you still do CMS stuff and want to get hired to do CMS stuff... leave it on there. If you don't want to do CMS stuff, take it off.
If you are applying to a job that isn't doing CMS stuff, on your resume that you're sending to them don't have more than a single bullet point for that old job about CMS duties.
That's super important in my opinion. I try and write as little as possible on my resume because I don't want to get asked about stuff I don't remember. I keep it to 1 page, write as little as possible and hope that people recognize the default LaTeX font and interview me because my super concise CV makes me look interesting/mysterious.
It's worked well enough for me, but it's a small sample size and luck plays a huge role of course.