core: add --detect_file_replacement flag and plumbing (redo) #5546
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This is a re-do of #5530, which I accidentally merged into the wrong branch (the temporary one I was using as a diffbase, rather than the intended destination of
master
).Add the
--detect_file_replacement
flag to control the behavior introduced in #5529, and all the associated plumbing in between.Note: since this flag would currently be pointless for RustBoard (
--load_fast=true
) we disallow the combination, and in the default automatic selection logic (--load_fast=auto
), we check for this flag and don't use RustBoard if it was passed.Tested: ran TensorBoard with these changes enabled (including behavior-introducing PR) and confirmed that it now picks up new data when replacing an event file entirely rather than appending to it, writes the appropriate log messages, disables RustBoard, etc.
Cc: #349.