Adding upstream version 0.11.1.upstream/0.11.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Tailer
+
+This directory contains the functionality for monitoring
+[remote files](https://docs.lnav.org/en/latest/usage.html#remote-files).  The
+name "tailer" refers to the binary that is transferred to the remote host that
+takes care of tailing files and sending the contents back to the host that is
+running the main lnav binary.  To ease integration with lnav's existing
+functionality, the remote files are mirrored locally.  The tailer also
+supports interactive use by providing previews of file contents and
+TAB-completion possibilities.
+
+## Files
+
+The important files in this directory are:
+
+- [tailer.main.c](tailer.main.c) - The main() implementation for the tailer.
+- [tailer.looper.hh](tailer.looper.hh) - The service in the main lnav binary
+  that transfers tailers to hosts and communicates with them.
+- [tailer.h](tailer.h) and [tailerpp.hh](tailerpp.hh) - Utility libraries for
+  the tailer protocol.
+- tailer.ape - The [αcτµαlly pδrταblε εxεcµταblε](https://justine.lol/ape.html)
+  build of the tailer.  This binary is produced by a GitHub Action and checked
+  in so the build process doesn't need to be supported on lots of platforms.
+
+## Flow
+
+When a remote-path is passed to lnav, the
+[file_collection.hh](../file_collection.hh) logic forwards the request to the
+`tailer::looper` service.  This service makes two connections to the remote
+host using the `ssh` command so that the user's custom configurations will be
+used.  The first connection is used to transfer the "tailer.ape" binary and
+make it executable.  The second connection starts the tailer and uses
+stdin/stdout for a binary protocol and stderr for logging.  The tailer then
+waits for requests to open files, preview files, and get possible paths for
+TAB-completions.