fix(ui): updated duplicate check error message

CHANGELOG.md

@@ -13,6 +13,7 @@
 1. [17363](https://github.com/influxdata/influxdb/pull/17363): Fixed telegraf configuration bugs where system buckets were appearing in the buckets dropdown
 1. [17391](https://github.com/influxdata/influxdb/pull/17391): Fixed threshold check bug where checks could not be created when a field had a space in the name
 1. [17384](https://github.com/influxdata/influxdb/pull/17384): Reuse slices built by iterator to reduce allocations
+1. [17404](https://github.com/influxdata/influxdb/pull/17404): Updated duplicate check error message to be more explicit and actionable
 
 ### UI Improvements
 

ui/src/checks/actions/thunks.ts

@@ -152,6 +152,13 @@ export const createCheckFromTimeMachine = () => async (
     const check = builderToPostCheck(state)
     const resp = await api.postCheck({data: check})
     if (resp.status !== 201) {
+      if (resp.data.code.includes('conflict')) {
+        throw new Error(
+          `A check named ${
+            check.name
+          } already exists. Please rename the check before saving`
+        )
+      }
       throw new Error(resp.data.message)
     }