chore: enhance issue template (#66)

Author: Timeless0911

.github/workflows/monitor-metrics.yaml

@@ -60,7 +60,13 @@ jobs:
             }
             const url = `${context.serverUrl}//${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`
             const urlLink = `[Open](${url})`
-            const issueTitle = `Benchmark Performance Degradation`
+            const date = new Date();
+            const year = date.getFullYear();
+            const month = ('0' + (date.getMonth() + 1)).slice(-2);
+            const day = ('0' + date.getDate()).slice(-2);
+            const today = `${year}-${month}-${day}`
+
+            const issueTitle = `Benchmark Performance Degradation (${today})`
             const issueBody = `
             📝 Benchmark detail: ${urlLink}