Santiago Pericas-Geertsen

Consider replacing usages of ConcurrentHashMap

1

## Problem Description `ConcurrentHashMap` is implemented using `synchronized` blocks. We recently found an issue that was causing some of our tests to hang due to the use of this class...

Allows the creation of empty SSE events

2

### Description Allows an SSE event to be created using no data. Uses a static constant SseEvent.NO_DATA to avoid returning null in getters. Updates serialization code and tests. See issue...

### Helidon gRPC SE - [x] #9140 - [ ] #9181 - [x] gRPC SE Metrics - [ ] gRPC SE Tracing - [ ] #9235 - [x] #9431

### Helidon gRPC MP - [x] gRPC MP End-to-end example in helidon-examples (https://github.com/helidon-io/helidon-examples/pull/65) - [x] #9146 - [x] #9151 - [ ] gRPC MP Security - [x] gRPC MP Metrics...

### Description Increases default value of write-buffer-size to 4K. This change provides a better out-of-the-box buffering strategy for chunked encoded HTTP responses. See issue #9189 for some testing results.

### Description New type of writer that can switch from async to sync writing dynamically based on average async queue size heuristics. It can be enabled as follows: ```yaml server:...

Better support for Context Propagation

2

Helidon has support for its own `Context` mechanism that can be automatically migrated across threads when using its own thread pools. There is also support for CDI context propagating in...

See issue #6096. WebClient reconnect is currently not supported.