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# Welcome to Sidekiq Pro 4.0!
Sidekiq Pro 4.0 is designed to work with Sidekiq 5.0.
## What's New
* Batches now "die" if any of their jobs die. You can enumerate the set
of dead batches and their associated dead jobs. The success callback
for a dead batch will never fire unless these jobs are fixed.
```ruby
Sidekiq::Batch::DeadSet.new.each do |status|
status.dead? # => true
status.dead_jobs # => [...]
end
```
This API allows you to enumerate the batches which need help.
If you fix the issue and the dead jobs succeed, the batch will succeed.
* The older `reliable_fetch` and `timed_fetch` algorithms have been
removed. Only super\_fetch is available in 4.0.
* The statsd middleware has been tweaked to remove support for legacy,
pre-3.6.0 configuration and add relevant tags.
* Requires Sidekiq 5.0.5+.
## Upgrade
* Upgrade to the latest Sidekiq Pro 3.x.
```ruby
gem 'sidekiq-pro', '< 4'
```
* Fix any deprecation warnings you see.
* Upgrade to 4.x.
```ruby
gem 'sidekiq-pro', '< 5'
```
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