Add validation and proper default for Opik URL

Also add better documentation link for Opik configuration in the UI

api/core/ops/entities/config_entity.py

@@ -69,12 +69,24 @@ class OpikConfig(BaseTracingConfig):
 
     @field_validator("project")
     @classmethod
-    def set_value(cls, v, info: ValidationInfo):
+    def project_validator(cls, v, info: ValidationInfo):
         if v is None or v == "":
             v = "Default Project"
 
         return v
 
+    @field_validator("url")
+    @classmethod
+    def url_validator(cls, v, info: ValidationInfo):
+        if v is None or v == "":
+            v = "https://www.comet.com/opik/api/"
+        if not v.startswith(("https://", "http://")):
+            raise ValueError("url must start with https:// or http://")
+        if not v.endswith("/api/"):
+            raise ValueError("url should ends with /api/")
+
+        return v
+
 
 OPS_FILE_PATH = "ops_trace/"
 OPS_TRACE_FAILED_KEY = "FAILED_OPS_TRACE"

web/app/(commonLayout)/app/(appDetailLayout)/[appId]/overview/tracing/config.ts

@@ -3,5 +3,5 @@ import { TracingProvider } from './type'
 export const docURL = {
   [TracingProvider.langSmith]: 'https://docs.smith.langchain.com/',
   [TracingProvider.langfuse]: 'https://docs.langfuse.com',
-  [TracingProvider.opik]: 'https://www.comet.com/docs/opik/',
+  [TracingProvider.opik]: 'https://www.comet.com/docs/opik/tracing/integrations/dify#setup-instructions',
 }