The server performance object-cache.php dropin needs a useful header

[OllieJones]

Bug Description

When Performance Lab is activated, visiting /wp-admin/plugins.php?plugin_status=dropins shows no useful information.

This isn't just a dashboard cosmetic issue; other code that handles drop-ins uses get_plugin_data() to figure out what's going on. The ability to understand the drop-in situation from code will be critical to the success of other drop-ins if this particular hack lives a long time (like hacks tend to do...).

Steps to reproduce

1. Install and activate some any object cache drop-in.
2. View the drop-ins via /wp-admin/plugins.php?plugin_status=dropins and observe useful info about the drop-in.
3. Install and activate Performance Lab.
4. View the drop-ins via /wp-admin/plugins.php?plugin_status=dropins and observe just rudimentary data.

Additional Context

• PHP Version: 7.4.3
• OS: Linux
• Browser: any
• Plugin Version: 1.8.0
• Device: any

Till did a good job of this in the redis object cache. https://github.com/rhubarbgroup/redis-cache/blob/develop/includes/object-cache.php

[felixarntz]

Thanks @OllieJones, I'll work on enhancing this. I keep forgetting that having a plugin header on drop-ins actually helps. Great catch!