Use full list of syslog logging severities

Author: jspahrsummers

schema/schema.json

@@ -857,11 +857,15 @@
             "type": "object"
         },
         "LoggingLevel": {
-            "description": "The severity of a log message.",
+            "description": "The severity of a log message.\n\nThese map to syslog message severities, as specified in RFC-5424:\nhttps://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1",
             "enum": [
+                "alert",
+                "critical",
                 "debug",
+                "emergency",
                 "error",
                 "info",
+                "notice",
                 "warning"
             ],
             "type": "string"

schema/schema.ts

@@ -650,8 +650,11 @@ export interface LoggingMessageNotification extends Notification {
 
 /**
  * The severity of a log message.
+ * 
+ * These map to syslog message severities, as specified in RFC-5424:
+ * https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1
  */
-export type LoggingLevel = "debug" | "info" | "warning" | "error";
+export type LoggingLevel = "debug" | "info" | "notice" | "warning" | "error" | "critical" | "alert" | "emergency";
 
 /* Sampling */
 /**