As this plugin can be a critical path to the inf set up, would be useful to add some health check using check API.

Candidates:

• proxyrangerequests is enabled, but "Test range request failed"
• A number of missing files are growing
• a basic check which is that it can both connect to the store and grab a known small test file
• if cloudfront is on, check that a remote url work. also check the CORS headers are good