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83 lines
2.1 KiB
Markdown
83 lines
2.1 KiB
Markdown
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# Structured Logging
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A structured logging system can be useful when your logs are destined for a machine to parse and process. By maintaining its machine-readable characteristics, it enables more efficient searching and aggregations when consumed by software such as the "ELK stack".
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Synapse's structured logging system is configured via the file that Synapse's `log_config` config option points to. The file must be YAML and contain `structured: true`. It must contain a list of "drains" (places where logs go to).
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A structured logging configuration looks similar to the following:
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```yaml
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structured: true
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loggers:
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synapse:
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level: INFO
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synapse.storage.SQL:
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level: WARNING
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drains:
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console:
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type: console
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location: stdout
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file:
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type: file_json
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location: homeserver.log
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```
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The above logging config will set Synapse as 'INFO' logging level by default, with the SQL layer at 'WARNING', and will have two logging drains (to the console and to a file, stored as JSON).
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## Drain Types
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Drain types can be specified by the `type` key.
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### `console`
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Outputs human-readable logs to the console.
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Arguments:
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- `location`: Either `stdout` or `stderr`.
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### `console_json`
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Outputs machine-readable JSON logs to the console.
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Arguments:
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- `location`: Either `stdout` or `stderr`.
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### `console_json_terse`
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Outputs machine-readable JSON logs to the console, separated by newlines. This
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format is not designed to be read and re-formatted into human-readable text, but
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is optimal for a logging aggregation system.
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Arguments:
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- `location`: Either `stdout` or `stderr`.
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### `file`
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Outputs human-readable logs to a file.
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Arguments:
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- `location`: An absolute path to the file to log to.
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### `file_json`
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Outputs machine-readable logs to a file.
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Arguments:
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- `location`: An absolute path to the file to log to.
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### `network_json_terse`
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Delivers machine-readable JSON logs to a log aggregator over TCP. This is
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compatible with LogStash's TCP input with the codec set to `json_lines`.
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Arguments:
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- `host`: Hostname or IP address of the log aggregator.
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- `port`: Numerical port to contact on the host.
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