Support for encryption in transit for Memcached

[DonovanSoftly]

Is your proposal related to a problem?

We have activated the encryption in transit on our Amazon ElastiCache for Memcached.
Afterwards, Thanos failed to connect to memcached like the error below.

ts=2024-04-09T02:47:04.90578891Z caller=memcached.go:250 level=error msg="failed to put to memcached" name= err="read tcp 10.170.59.248:58922->10.170.49.42:11211: read: connection reset by peer"

Describe the solution you'd like

Support for encryption in transit for Memcached

[jeroen-nijssen]

We are looking into some cost saving (besides the security aspect) and it seems that AWS ElastiCache Memcached Serverless requires the connection to encrypted.

So it would be great if this feature is pushed trough.. !

[yeya24]

In our Thanos fork, we added memcached TLS support for the exact the same reason. We will try to contribute our changes back when we get the chance.