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docs: administration: configuring-fluent-bit: classic-mode: note FLB_LOG_LEVEL for log_level #2703

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eschabell merged 1 commit into from
Sep 11, 2026
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docs: administration: configuring-fluent-bit: classic-mode: note FLB_LOG_LEVEL for log_level #2703

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2 changes: 1 addition & 1 deletion administration/configuring-fluent-bit/classic-mode/configuration-file.md
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Expand Up @@ -38,7 +38,7 @@ The `Service` section defines global properties of the service. The following ke
| `json.convert_nan_to_null` | If enabled, `NaN` converts to `null` when Fluent Bit converts `msgpack` to `json`. | `false` |
| `json.escape_unicode` | Controls how Fluent Bit serializes non‑ASCII / multi‑byte Unicode characters in JSON strings. When enabled, Unicode characters are escaped as `\uXXXX` sequences (characters outside BMP become surrogate pairs). When disabled, Fluent Bit emits raw UTF‑8 bytes. | `true` |
| `log_file` | Absolute path for an optional log file. By default all logs are redirected to the standard error interface (stderr). | _none_ |
| `log_level` | Set the logging verbosity level. Allowed values are: `off`, `error`, `warn`, `info`, `debug`, and `trace`. Values are cumulative. If `debug` is set, it will include `error`, `warning`, `info`, and `debug`. Trace mode is only available if Fluent Bit was built with the `FLB_TRACE` option enabled. | `info` |
| `log_level` | Set the logging verbosity level. Allowed values are: `off`, `error`, `warn`, `info`, `debug`, and `trace`. Values are cumulative. If `debug` is set, it will include `error`, `warning`, `info`, and `debug`. Trace mode is only available if Fluent Bit was built with the `FLB_TRACE` option enabled. You can also set this value with the `FLB_LOG_LEVEL` environment variable, which takes precedence over this key. See [Log level](../yaml/service-section.md#log-level). | `info` |
| `parsers_file` | Path for a `parsers` configuration file. Multiple `Parsers_File` entries can be defined within the section. | _none_ |
| `plugins_file` | Path for a `plugins` configuration file. A `plugins` configuration file defines paths for external plugins. [See an example](https://github.com/fluent/fluent-bit/blob/master/conf/plugins.conf). | _none_ |
| `scheduler.base` | Set a base of exponential backoff. Supported in v1.8.7 and greater. | `5` |
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