Should I clean past instances of an app?

Hi,

While trying to figure out why my healthchecks were failing (I found why :wink:), I ran into the command fly status all while scanning the documentation and got:

Instances
ID              PROCESS VERSION REGION  DESIRED STATUS          HEALTH CHECKS                   RESTARTS        CREATED              
5141aea2        app     14 ⇡    fra     run     running         2 total, 1 passing, 1 critical  0               4m35s ago           
51ddb24c        app     13      fra     stop    complete        2 total, 1 passing, 1 critical  0               9m33s ago           
27bf18f0        app     12      fra     stop    complete        2 total, 1 passing, 1 critical  0               22m30s ago          
e9c0f535        app     11      fra     run     running         2 total, 2 passing              0               2022-09-15T21:08:57Z
01ede9cd        app     10      fra     stop    complete        2 total, 1 passing, 1 critical  0               2h45m ago           
409ec552        app     5       fra     stop    failed          2 total                         2               2022-09-15T16:21:32Z
4b7b376a        app     3       fra     stop    failed          2 total                         2               2022-09-15T15:22:17Z

I have several questions:

  1. Should I be concerned that v11 is running?
  2. Can I clean the old deployment? At least the v3 and v5 that failed? Should I?