leon756 commented on code in PR #10990:
URL: https://github.com/apache/skywalking/pull/10990#discussion_r1241063557


##########
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/metrics/Event.java:
##########
@@ -153,8 +154,15 @@ public boolean combine(final Metrics metrics) {
      * @since 9.0.0 Limit the length of {@link #parameters}
      */
     public void setParameters(String parameters) {
-        this.parameters = parameters == null || parameters.length() <= 
PARAMETER_MAX_LENGTH ?
-            parameters : parameters.substring(0, PARAMETER_MAX_LENGTH);
+        if (parameters == null || parameters.length() <= PARAMETER_MAX_LENGTH) 
{
+            this.parameters = parameters;
+        } else {
+            try {
+                this.parameters = StringUtil.trimJson(parameters, 
PARAMETER_MAX_LENGTH);
+            } catch (Exception e) {

Review Comment:
   I am not quite sure that the original parameters must be in json format



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