Remote Procedure Call (RPC)

HealthCheckThread is replaced by StartHealthCheck function in socket.cpp, but some of the docs/comments are not modified correspondingly. There are 3 files that HealthCheckThread is involved in:

• test/brpc_socket_unittest.cpp(3 occurrences)
• docs/cn/load_balancing.md(1 occurrence)
• src/brpc/socket.h(1 occurrence)

All sentences with 'HealthCheckThread' should be rewritten to sync with the

The MinSendBackupAfterMs is now set to 1 ms. Unfortunately this causes backup requests to be send when there is low load. It would be useful if we could set the minimum a little bit higher for certain endpoints.

The current exporter doesn't support OpenMetrics format. It's fairly simple and most of this is actually handled directly by the prometheus library itself via the TextFormat class. See: https://github.com/AngerM/ag_server/blob/main/base/src/main/kotlin/dev/angerm/ag_server/http/PrometheusHandler.kt
Which I based off of https://github.com/prometheus/client_java/blob/master/simpleclient_httpserver

We hope mores developers join CloudWeGo. This is a task issue which need your help.

Issue Description
Write a business demo code use Kitex, which can guide users how to use Kitex.
Please submit your code to https://github.com/cloudwego/kitex-examples/bizdemo/{yourdemo}.

Picked

• TODO by @longlihale
• TODO by @L0uisJ0shua