… in one DSN (nicolas-grekas)This PR was merged into the 4.2-dev branch.Discussion----------[Cache] support configuring multiple Memcached servers in one DSN| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | yes| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets |#27855| License       | MIT| Doc PR        |symfony/symfony-docs#10402Useful to reconfigure dynamically an array of memcached servers (eg removing a dead one or adding a new one).DSN format is e.g. `memcached://localhost?host[foo.bar]=3`.To ease generating the DSN programmatically, it works also with `memcached:?host[localhost]&host[localhost:12345]&host[/some/memcached.sock:]=3`.The key of the "host" parameter is a "host:port" pair, the value is the weight of the "host:port" pair.Sockets need to be specified with the trailing `:` (as shown in the last example).Commits-------8e0605a [Cache] support configuring multiple Memcached servers in one DSN

… via DSN (nicolas-grekas)This PR was merged into the 4.2-dev branch.Discussion----------[Cache] added support for connecting to Redis clusters via DSN| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | yes| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets | -| License       | MIT| Doc PR        | -Replaces#28300 and#28175This PR allows configuring a cluster of Redis servers using all available options of either the phpredis extension or the Predis package:- the `redis_cluster=0/1` boolean option configures whether the client should use the Redis cluster protocol;- several hosts can be provided using a syntax very similar to#28598, enabling consistent hashing distribution of keys;- `failover=error/distribute/slaves` can be set to direct reads at slave servers;- extra options are passed as is to the driver (e.g. `profile=2.8`)- Predis per-server settings are also possible, using e.g. `host[localhost][alias]=foo` in the query string, or `host[localhost]=alias%3Dfoo` (ie PHP query arrays or urlencoded key/value pairs)Commits-------a42e877 [Cache] added support for connecting to Redis clusters via DSN