[GitHub] [skywalking] EvanLjp commented on a change in pull request #6388: Introduce log analysis language (LAL)

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EvanLjp commented on a change in pull request #6388:
URL: https://github.com/apache/skywalking/pull/6388#discussion_r577641853



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File path: docs/en/concepts-and-designs/lal.md
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+# Log Analysis Language
+
+Log Analysis Language (LAL) in SkyWalking is essentially a Domain-Specific Language (DSL) to analyze logs. You can use
+LAL to parse, extract, filter, analyze, and save the logs, as well as collaborate the logs with traces, and metrics.
+
+Check the [`default.yaml`](../../../oap-server/server-bootstrap/src/main/resources/lal/default.yaml) for examples.
+
+## Filter
+
+A filter is a group of [parser](#parser), [extractor](#extractor) and [sink](#sink). Users can use one or more filters
+to organize their processing logics. Every piece of log will be sent to all filters in an LAL rule. The piece of log sent into the filter is available as property `log` in the LAL, therefore you can access the log level via `log.level`.

Review comment:
       Note that log.level does not exist in the protocol; it is a dynamic field in TAG




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