Initialise number of log lines seen to support refresh #1784
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Follow-up to #708 which adds a mechanism to flush the tail of the log on restart. I noticed some missing log lines in case of refresh. This PR fixes this by initialising the number of lines seen from the existing file.
There is a race condition here since the kernel is concurrently writing to the log file. If this happens there will be duplicate lines in the tail of the log when the runtime restarts, but no missing lines.
In addition: