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Containerd uses the last error message sent to the log to
print as failure cause for create/exec. This required a
few changes in the logging logic for runsc:
- cmd.Errorf/Fatalf: now writes a message with 'error'
level to containerd log, in addition to stderr and
debug logs, like before.
- log.Infof/Warningf/Fatalf: are not sent to containerd
log anymore. They are mostly used for debugging and not
useful to containerd. In most cases, --debug-log is
enabled and this avoids the logs messages from being
duplicated.
- stderr is not used as default log destination anymore.
Some commands assume stdio is for the container/process
running inside the sandbox and it's better to never use
it for logging. By default, logs are supressed now.
PiperOrigin-RevId: 251881815
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