We figured out that we are a bit unsure about what exactly is stored in redis "page and default cache".
Until now, we thought it is only about configuration, and maybe some page templates. But today, we rolled back a deployment in a test system, and at least one feature was not rolled back until we cleared the redis cache.
That one feature was a patch to a module in the vendors directory.
We wonder now what exactly is cached in the redis and default cache in order to know in which situations after a deployment we have to clear the cache.