preamble-len-...

The ... header isn't too long or too short.

Examples

error[preamble-len-title]: preamble header `title` value is too long (max 44)
 --> input.md:3:7
  |
3 | title: A sample proposal whose title is too long to still be considered valid for the purposes of the Ethereum Improvement Proposal processes and the repository in which they reside
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ too long
  |
error[preamble-len-description]: preamble header `description` value is too long (max 140)
 --> input.md:4:13
  |
4 | description: A sample proposal whose title is too long to still be considered valid for the purposes of the Ethereum Improvement Proposal processes and the repository in which they reside
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ too long
  |
error[preamble-len-requires]: preamble header `requires` value is too short (min 1)
  --> input.md:10:10
   |
10 | requires:
   |           too short
   |

Explanation

The preamble-len-... family of lints check a front matter (or preamble) field's value to make sure it isn't too long or too short.

The specific length requirements for each field are listed in the error message.