Restructure the Audit log page

doc/code_snippets/snippets/config/instances.enabled/audit_log/config.yaml

@@ -10,7 +10,7 @@ groups:
             audit_log:
               to: file
               file: 'audit_tarantool.log'
-              filter: [ user_create,data_operations,ddl ]
+              filter: [user_create,data_operations,ddl,custom]
               format: json
-              spaces: [ bands ]
+              spaces: [bands]
               extract_key: true

doc/code_snippets/snippets/config/instances.enabled/audit_log/myapp.lua

@@ -0,0 +1,31 @@
+-- myapp.lua --
+local audit = require('audit')
+
+-- Log message string
+audit.log('Hello, Alice!')
+-- Log format string and arguments
+audit.log('Hello, %s!', 'Bob')
+-- Log table with audit log field values
+audit.log({type = 'custom_hello', description = 'Hello, World!'})
+audit.log({type = 'custom_farewell', user = 'eve', module = 'custom', description = 'Farewell, Eve!'})
+-- Create a new log module
+local my_audit = audit.new({type = 'custom_hello', module = 'my_module'})
+my_audit:log('Hello, Alice!')
+my_audit:log({tag = 'admin', description = 'Hello, Bob!'})
+-- Log 'Hello!' message with the VERBOSE severity level
+audit.log({severity = 'VERBOSE', description = 'Hello!'})
+
+-- Log 'Hello!' message with a shortcut helper function
+audit.verbose('Hello!')
+
+-- Like audit.log(), a shortcut helper function accepts a table of options
+audit.verbose({description = 'Hello!'})
+
+-- Severity levels are available for custom loggers
+local my_logger = audit.new({module = 'my_module'})
+my_logger:log({severity = 'ALARM', description = 'Alarm'})
+my_logger:alarm('Alarm')
+
+-- Overwrite session_type and remote fields
+audit.log({type = 'custom_hello', description = 'Hello!',
+           session_type = 'my_session', remote = 'my_remote'})