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Update Patroni Postgres settings for HA environments

Nailia Iskhakova requested to merge docs-reference-arch-patroni-settings-update into master

What does this MR do?

The MR updates patroni['postgresql']['max_replication_slots'] and patroni['postgresql']['max_wal_senders'] to 6 and 7 accordingly as by design all reference architectures have 3 PG nodes (3 PG instances (x2) / 3 PG instances (x2) + 1). As discussed in https://gitlab.com/gitlab-org/quality/gitlab-environment-toolkit/-/issues/143#note_636904107, the previous numbers were including a Geo instance in HA env setups and should be updated.

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Edited by Nailia Iskhakova

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