| # Release Notes |
| Release Notes - Apache ServiceComb - Version service-center-2.1.0 |
| |
| ## Bug |
| - [SCB-2400](https://issues.apache.org/jira/browse/SCB-2400) - Govern api return empty schemaIds |
| - [SCB-2403](https://issues.apache.org/jira/browse/SCB-2403) - Start up failed when upgrade sc version |
| - [SCB-2404](https://issues.apache.org/jira/browse/SCB-2404) - Return internal properties when list all microservices |
| - [SCB-2411](https://issues.apache.org/jira/browse/SCB-2411) - Try dlock before start retirement job |
| - [SCB-2418](https://issues.apache.org/jira/browse/SCB-2418) - Fix etcd metrics not correct |
| - [SCB-2420](https://issues.apache.org/jira/browse/SCB-2420) - Can not delete unused role |
| ## New Feature |
| - [SCB-2402](https://issues.apache.org/jira/browse/SCB-2402) - Support synchronization of multiple registries |
| - [SCB-2401](https://issues.apache.org/jira/browse/SCB-2401) - Append inner properties when heartbeat success |
| - [SCB-2408](https://issues.apache.org/jira/browse/SCB-2408) - Add put instance service |
| - [SCB-2409](https://issues.apache.org/jira/browse/SCB-2409) - Add resource usage service |
| - [SCB-2412](https://issues.apache.org/jira/browse/SCB-2412) - Add dlock service |
| - [SCB-2414](https://issues.apache.org/jira/browse/SCB-2414) - Add schema retire cron job |
| - [SCB-2415](https://issues.apache.org/jira/browse/SCB-2415) - Add schema ref |
| - [SCB-2419](https://issues.apache.org/jira/browse/SCB-2419) - Add govern service |
| ## Improvement |
| - [SCB-2405](https://issues.apache.org/jira/browse/SCB-2405) - Use dlock instead |
| - [SCB-2406](https://issues.apache.org/jira/browse/SCB-2406) - Using cari's mongo db client |
| - [SCB-2407](https://issues.apache.org/jira/browse/SCB-2407) - Using cari db client |
| - [SCB-2410](https://issues.apache.org/jira/browse/SCB-2410) - Refactoring disco service |
| - [SCB-2413](https://issues.apache.org/jira/browse/SCB-2413) - Refactoring RBAC datasource interface |
| - [SCB-2416](https://issues.apache.org/jira/browse/SCB-2416) - Refactoring quota mgr |
| - [SCB-2417](https://issues.apache.org/jira/browse/SCB-2417) - Refactoring schema service |
