- implement `SentinelPreFilter`, `SentinelPostFilter` and `SentinelErrorFilter`
- support fallback

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Make fallbackToLocalWhenFail of cluster rules configurable in dashboard
- Fix edit rule when hit cancel button (object share problem solved by deep copy)
- Add metric table td header's title for friendly prompt info

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add cluster server list and assign page and client list page (for a specific app)

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add cluster token server management controller and service for app
- Other enhancements and fixes

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Also add top-K frequent parameter statistic support

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Enlarge retry timeout to 2s by default
- Improve remote address representation

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add a demo Spring Boot application integrated with cluster flow control to show the recommended way

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Refactor token client common config and assign config
- Log enhancement when transport to token server failed
- Add `getState` method to `ClusterTokenClient` interface

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- use `netty-handler` instead to reduce size

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Support stop cluster mode (`NOT-STARTED` mode)
- Fix bug when updating cluster state via command API (should modify via state property)

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add `UnaryLeapArray` and `RequestLimiter` to enable simple QPS limit
- Improve cluster rule manager and server config manager to support request limiter
- Support `TOO_MANY_REQUEST` status in client side
- Also improve the automatic namespace register of embedded server mode

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Refactor MetricBucket to support add multiple count
- Refactor Node and Metric related classes
- Refactor for StatisticSlot

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Do not remove the first node

@see https://github.com/alibaba/Sentinel/issues/276

- the wrong `isEmpty` check causes the rule cannot be deleted

- by @cdfive

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

* Polish #272: upgrade nacos-client version and create a new constructor for NacosDataSource to support namespace, endpoint, ak, sk and so on
* check properties in NacosDataSource

Signed-off-by: Allen Sun <allensun.shl@alibaba-inc.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

* Fix #330 : fix listMetricFiles() returns wrong file name list.

Signed-off-by: Carpenter Lee <hooleeucas@163.com>

* Add timestamp check when read metrics.

Signed-off-by: Carpenter Lee <hooleeucas@163.com>

* Refine test case

Signed-off-by: Carpenter Lee <hooleeucas@163.com>

- Code refinement for heartbeat component in transport related module
- Add remove support of `SentinelConfig`

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- The constructor now accept `sampleCount` and `windowIntervalMs` so that it can match the two basic properties

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Modify the init order of command center init func to -1 (prioritized than before)
- Add CommandConstants for common use

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

ClusterTokenClient.java,TokenClientProvider.java in package `com.alibaba.csp.sentinel.cluster`

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Carpenter Lee <hooleeucas@163.com>