[RFC] Show warnings on risky configurations

[rvanlaak]

Today I found out about what opcache.interned_strings_buffer does. Seems there isn't much documentation about this.

It would be great if the status page is able to give the user some warnings about poor/non-optimal configuration parameters. Examples of these warnings could be:

• Your opcache.memory_consumption is almost out of memory, we suggest to raise it.
• Your opcache.interned_strings_buffer is almost out of memory, we suggest to raise it.
• There aren't many free keys, we suggest to raise opcache.max_accelerated_files.
• You have a lot of wasted memory, maybe you can do to solve it.

Maybe this isn't something the status page should do, but would be great if so.

[cfoellmann]

If you like to contribute open this up on https://github.com/wp-cloud/opcache-status/issues