Update Redis recommended minimum version in requirements doc

This matches lib/system_check/app/redis_version_check.rb to avoid
confusion.

doc/install/requirements.md

@@ -251,7 +251,7 @@ Redis stores all user sessions and the background task queue.
 The requirements for Redis are as follows:
 
 - Redis 6.x or 7.x is required in GitLab 16.0 and later. However, you should upgrade to
-Redis 6.2 or later as [Redis 6.0 is no longer supported](https://endoflife.date/redis).
+Redis 6.2.14 or later as [Redis 6.0 is no longer supported](https://endoflife.date/redis).
 - Redis Cluster mode is not supported. Redis Standalone must be used, with or without HA.
 - Storage requirements for Redis are minimal, about 25 kB per user on average.
 - [Redis eviction mode](../administration/redis/replication_and_failover_external.md#setting-the-eviction-policy) set appropriately.

lib/system_check/app/redis_version_check.rb

@@ -25,7 +25,7 @@ def check?
           @custom_error_message = "Your Redis version #{redis_version} is not supported anymore. Update your Redis server to a version >= #{RECOMMENDED_REDIS_VERSION}"
           status = false
         elsif Gem::Version.new(redis_version) < Gem::Version.new(RECOMMENDED_REDIS_VERSION)
-          @custom_error_message = "Support for your Redis version #{redis_version} has been deprecated and will be removed soon. Update your Redis server to a version >= #{RECOMMENDED_REDIS_VERSION}"
+          @custom_error_message = "Your Redis version #{redis_version} has reached end-of-life (EOL). Update your Redis server to a version >= #{RECOMMENDED_REDIS_VERSION}"
           status = false
         end
 

spec/lib/system_check/app/redis_version_check_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe SystemCheck::App::RedisVersionCheck, :silence_stdout, feature_category: :shared do
+  let(:checker) { described_class.new }
+
+  describe '#check?' do
+    using RSpec::Parameterized::TableSyntax
+
+    where(:info, :expected, :message) do
+      { 'redis_version' => nil } | false |
+        "Could not retrieve the Redis version. Please check if your settings are correct"
+      { 'redis_version' => '5.9.0' } | false |
+        ("Your Redis version 5.9.0 is not supported anymore. " \
+          "Update your Redis server to a version >= #{described_class::RECOMMENDED_REDIS_VERSION}")
+      { 'redis_version' => '6.0.0' } | false |
+        ("Your Redis version 6.0.0 has reached end-of-life (EOL). " \
+          "Update your Redis server to a version >= #{described_class::RECOMMENDED_REDIS_VERSION}")
+      { 'redis_version' => '6.2.14' } | true | nil
+    end
+
+    with_them do
+      it do
+        Gitlab::Redis::Queues.with do |redis|
+          allow(redis).to receive(:info).and_return(info)
+        end
+
+        expect(checker.check?).to eq(expected)
+        expect(checker.instance_variable_get(:@custom_error_message)).to eq(message)
+      end
+    end
+  end
+end