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docs/VictoriaLogs/README.md: add Upgrading
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VictoriaLogs emits own logs to stdout. It is recommended investigating these logs during troubleshooting.
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VictoriaLogs emits own logs to stdout. It is recommended investigating these logs during troubleshooting.
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## Upgrading
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It is safe upgrading VictoriaLogs to new versions unless [release notes](https://github.com/VictoriaMetrics/VictoriaMetrics/releases) say otherwise.
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It is safe skipping multiple versions during the upgrade unless [release notes](https://github.com/VictoriaMetrics/VictoriaMetrics/releases) say otherwise.
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It is recommended performing regular upgrades to the latest version, since it may contain important bug fixes, performance optimizations or new features.
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It is also safe downgrading to older versions unless [release notes](https://github.com/VictoriaMetrics/VictoriaMetrics/releases) say otherwise.
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The following steps must be performed during the upgrade / downgrade procedure:
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* Send `SIGINT` signal to VictoriaLogs process in order to gracefully stop it.
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See [how to send signals to processes](https://stackoverflow.com/questions/33239959/send-signal-to-process-from-command-line).
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* Wait until the process stops. This can take a few seconds.
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* Start the upgraded VictoriaMetrics.
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## Retention
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## Retention
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By default VictoriaLogs stores log entries with timestamps in the time range `[now-7d, now]`, while dropping logs outside the given time range.
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By default VictoriaLogs stores log entries with timestamps in the time range `[now-7d, now]`, while dropping logs outside the given time range.
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