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6aa8913392
Fix a logmon leak causing high goroutine and memory usage when a task restarts. Logmon `FileRotator` buffers the task stdout/stderr streams and periodically flushing them to log files. Logmon creates a new FileRotator for each stream for each task run. However, the `flushPeriodically` goroutine is leaked when a task restarts, holding a reference to a no-longer-needed `FileRotator` instance along with its 64kb buffer. The cause is that the code assumed `time.Ticker.Stop()` closes the ticker channel, thereby terminating the goroutine, but the documentation says otherwise: > Stop turns off a ticker. After Stop, no more ticks will be sent. Stop does not close the channel, to prevent a concurrent goroutine reading from the channel from seeing an erroneous "tick". https://pkg.go.dev/time#Ticker.Stop