## Why are these changes needed?
This PR does 2 things.
1. When `--detail` is specified, set the default formatting as yaml.
2. It seems like it takes 5 seconds to register the head node to the API server (because it gets node info every 5 second, and when the API server just starts, the head node is not registered to GCS). It decreases the node ping frequency until the head node is registered to API server.
## Related issue number
Closes https://github.com/ray-project/ray/issues/26939
Signed-off-by: Alan Guo <aguo@anyscale.com>
## Why are these changes needed?
Reduces memory footprint of the dashboard.
Also adds some cleanup to the errors data.
Also cleans up actor cache by removing dead actors from the cache.
Dashboard UI no longer allows you to see logs for all workers in a node. You must click into each worker's logs individually.
<img width="1739" alt="Screen Shot 2022-07-20 at 9 13 00 PM" src="https://user-images.githubusercontent.com/711935/180128633-1633c187-39c9-493e-b694-009fbb27f73b.png">
## Related issue number
fixes#23680fixes#22027fixes#24272
Currently `wait_until_succeeded_without_exception` is used in the dashboard, and it returns True/False. Unfortunately, there are lots of code that doesn't assert on this method (which means things are not actually tested).
