Sejong Kim

## Bug description Below errors were occurred after following the tutorial. On client side, `time="2022-02-13T16:17:40Z" level=error msg="Get \"https://172.17.0.4:22211/discover\": x509: certificate relies on legacy Common Name field, use SANs instead"` On...

**Description** I followed instructions of 'Avro And Confluent Cloud Schema Registry' in the confluent docs([Python: Code Example for Apache Kafka](https://docs.confluent.io/platform/current/tutorials/examples/clients/docs/python.html#avro-and-confluent-cloud-schema-registry)) and met a type error when running **`examples/clients/cloud/python/consumer_ccsr.py`** $ python...

Refine test codes in Tree to clearly describe feature specification

1

**Description**: Currently, test codes of CRDT play an important role in not only testing but also describing feature specifications. However, due to increased complexity, the codes in Tree are unable...

**What would you like to be added**: Through the PRs #659 and #705, Yorkie now supports merge and split operations in Tree. However, concurrent edits for these operations are not...

Introduce broadcast API for event sharing

7

**What would you like to be added**: Yorkie presently relies on the Publish-Subscribe model for sharing document and presence events (refer to: [pub-sub.md](https://github.com/yorkie-team/yorkie/blob/main/design/pub-sub.md)). However, this lacks the capability to extend...

Support collecting metrics for MongoDB sharded clusters

9

**What would you like to be added**: It seems necessary to collect metrics for MongoDB sharded clusters. Currently, the existing monitoring system focuses on Yorkie metrics and go process metrics,...