Investigate (and disable by default) the Sidekiq Memory Killer configs for K8s envs
According to [Sidekiq Memory Killer docs](https://gitlab.com/gitlab-org/gitlab/blob/d4fecb130702b2053d8ed6f78a573caed77759ed/doc/administration/operations/sidekiq_memory_killer.md#L29-44), it'll run as _legacy_ mode by default. Meaning that: ```markdown In _legacy_ mode, if the Sidekiq process exceeds the allowed RSS then an irreversible delayed graceful restart will be triggered. The restart of Sidekiq will happen after `SIDEKIQ_MEMORY_KILLER_GRACE_TIME` seconds. ``` So for K8s envs (Helm charts), ideally we should configure that to be handled per container / pod and disable the lib by default.
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