[sentrivana]

Description

Partially reverts #7058 so projects pinned to redis-py 3.x and redis-py-cluster 2.x keep their Redis instrumentation in 3.0. With the 4.2 minimum, an explicitly configured RedisIntegration() raises DidNotEnable and sentry_sdk.init() fails.

This came up while dogfooding 3.0 in getsentry/sentry, which is pinned to redis-py 3.4.1 because it still uses redis-py-cluster (which requires redis<4). It also can't move past redis-py 4.x yet because rb breaks on redis-py 5+.

Only what's needed for those versions is restored:

• Lower the redis-py minimum from 4.2 to 3.4.1.
• Patch the redis.asyncio client and pipeline only if redis.asyncio exists (added in redis-py 4.2). This import was guarded in 2.x and chore(redis): Drop support for < 4.2 #7058 made it unconditional, which is the actual reason 3.x stopped working.
• Restore the redis-py-cluster instrumentation, limited to 2.x. 1.x requires redis-py 2.x, which is below the new minimum, so the StrictRedisCluster/StrictClusterPipeline branches aren't brought back.
• Re-add the redis_py_cluster_legacy test suite (rewritten for span streaming and the 3.0 attribute names) and its CI entry.

Kept from #7058: the max_data_size removal and the StrictRedis -> Redis switch.

tox.ini was regenerated with populate_tox.py --only redis redis_py_cluster_legacy to avoid unrelated matrix churn. This adds redis 3.4.1/3.5.3 and drops 4.2.2 as the lowest 4.x env. CI only runs redis 3.x on py3.7/3.8 because of its classifiers. I also checked 3.4.1 + rb + redis-py-cluster 2.1.0 on Python 3.13 manually against getsentry/sentry.

[linear-code]

PY-3

[github-actions]

Coverage Results 📊

✅ 57541 passed | ⏭️ 3008 skipped | Total: 60549 | Pass Rate: 95.03% | Execution Time: 152m 48s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -83763
Passed Tests	📉 -79315
Failed Tests	—
Skipped Tests	📉 -4448

All tests are passing successfully.

✅ Patch coverage is 100.00% (18 of 18 changed executable lines covered; target 80%).
Project statement coverage is 90.36% (up 0.03 percentage points from base (e0a5492) to head (ec553ab)).

Changed files with executable lines (3)

File	Patch coverage	Changed executable lines
sentry_sdk/integrations/redis/init.py	100.00%	2/2 covered
sentry_sdk/integrations/redis/redis.py	100.00%	6/6 covered
sentry_sdk/integrations/redis/redis_py_cluster_legacy.py	100.00%	10/10 covered

Coverage diff

@@            Coverage Diff             @@
##        master     #8168       +/-##
==========================================
+ Coverage    90.33%    90.36%    +0.03%
==========================================
  Files          203       199        -4
  Tracked lines     26872     21266     -5606
  Branches     10044      7360     -2684
==========================================
- Hits         24272     19215     -5057
+ Misses        2600      2051      -549
+ Partials      1520      1235      -285

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