doc: remove appmetrics from tierlist
Hey
Context
The diagnostic working group currently works on an initiative to re-evaluate the diagnostic tooling list and its maturity.
Note: it's normally the last batch of updates before closing the issue.
Updated
In the previous instance, we examined the case of the appmetrics
module: issue link.
As anyone in the instance has an idea about a potential usage in the field, we decided to remove it. As said in the previous PRs, we prefer to have a list that contains fewer items but is trustable.
But in case you have a different opinion, please share your thoughts in this PR
Discuss
As usual, feel free to share your thoughts on that and your experience with this tool.
With love
cc @nodejs/diagnostics