Function logs
A function writes logs to Yandex Cloud Logging, to the default log group for the folder where the function is located.
There are two types of logs:
- Automatic: Logs of requests to functions.
- Custom: Logs that custom code writes to the standard output (
stdout) and standard error output (stderr).
Learn more about working with logs in the Yandex Cloud Logging documentation.
Structured logs
Apart from text, structured logs in the following JSON format can be written to the stdout and stderr standard output streams:
message/msg: Entry text.level: Logging level. Possible logging levels:TRACE,DEBUG,INFO,WARN,ERROR, andFATAL.
All the fields, except message/msg and level, are automatically logged to json-payload.
A log must be single-line. Any entry that contains the message/msg field and is up to 64 KB is considered to be a structured log. If the entry size is larger, it's split into multiple records and treated as text.
You can disable structured logs by setting the environment variable STRUCTURED_LOGGING = false. In this case, any JSON log is considered to be plain text.