FORGE_API_OLD
What happened
The level the file declares still runs, and a newer level exists. The message gives the date the older level is supported until.
What to do
Move the file to the level the message names before that date. The deprecation policy says how long a level is supported.
Example
text
strategy.py, line 1: FORGE_API 1 is supported until 2027-06-30. Move this file to FORGE_API 2 before then. [FORGE_API_OLD]The wording of the message depends on your file, and the code does not. A warning does not stop the file from loading.