docs: Update _index.md: add information about non-blocking mode to the documentation (#15910)

Signed-off-by: Roked <[email protected]>
Co-authored-by: J Stickler <[email protected]>
(cherry picked from commit 10fef0c)

Author: 2 people

docs/sources/send-data/docker-driver/_index.md

@@ -81,4 +81,6 @@ The driver keeps all logs in memory and will drop log entries if Loki is not rea
 
 The wait time can be lowered by setting `loki-retries=2`, `loki-max-backoff=800ms`, `loki-timeout=1s` and `keep-file=true`. This way the daemon will be locked only for a short time and the logs will be persisted locally when the Loki client is unable to re-connect.
 
+Also you can use non-blocking mode by setting `services.logger.logging.options.mode=non-blocking` in your `docker-compose` file. Non-blocking means that the process of writing logs to Loki will not block the main flow of an application or service if Loki is temporarily unavailable or unable to process log messages. In non-blocking mode, log messages will be buffered and sent to Loki asynchronously, which allows the main thread to continue working without delay. If Loki is unavailable, log messages will be stored in a buffer and sent when Loki becomes available again. However, this setting is useful to prevent blocking the main flow of an application or service due to logging issues, but it can also lead to loss of log messages if the buffer overflows or if Loki is unavailable for a long time.
+
 To avoid this issue, use the Promtail [Docker target](https://grafana.com/docs/loki/<LOKI_VERSION>/send-data/promtail/configuration/#docker) or [Docker service discovery](https://grafana.com/docs/loki/<LOKI_VERSION>/send-data/promtail/configuration/#docker_sd_configs).