Fallback icon if favicon isn't present
Hi, there is a fallback icon of course if you site don’t have any, but in you case your server does serve a /favicon.ico file which is a blank gif (not very valid), that’s why you see a blank space instead of the default icon. You should remove this gif if you don’t want it to showup.
Most API endpoints won't have an icon. I just added monitoring to ~10 endpoints, half have favicon, the other half don't.
Would look better in the overview if the data 'aligned', right now it's empty whitespace for sites without a favicon.