You
df says 96% full, du disagrees. What is going on?
ChatGPT
Almost always a deleted file still held open by a process, so the space is gone but no path points at it. lsof +L1 lists them; restarting the holder releases the space instantly.
You
My service restarts in a loop and floods the journal.
ChatGPT
Add a backoff. RestartSec=5 plus StartLimitIntervalSec=120 and StartLimitBurst=5 turns a hot loop into five attempts and then a stop, which is what you want: a service that cannot start should stay down loudly rather than churn quietly.