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15fcd6d599
systemd/journal should be configured manually. Interpreting PPID 1 as systemd unit is wrong, especially when embedded etcd runs under Docker container. For such case, every single log write will error and fall back to stderr, which is inefficient. Instead, add "systemd/journal" log output option and returns error if systemd/journal socket cannot be found. "--logger=zap --log-outputs=default" will only error for v3.4, since zap logger is still experimental. v3.5 deprecates capnslog and changes "--log-outputs" default value to "--log-outputs=stderr". Signed-off-by: Gyuho Lee <gyuhox@gmail.com>