feat: Allow configuring keep_alive via environment variable

[szokeasaurusrex]

This commit enables the keep_alive option to be set via the SENTRY_KEEP_ALIVE environment variable. When both the environment variable and the argument are provided, the argument takes precedence.

Closes #4354

[codecov]

⚠️ Parser warning

The parser emitted a warning. Please review your JUnit XML file:

Warning while parsing testcase attributes: Limit of string is 1000 chars, for name, we got 2301 at 1:2560 in /home/runner/work/sentry-python/sentry-python/.junitxml

---

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
23654	4	23650	5865

View the top 3 failed test(s) by shortest run time

tests.integrations.redis.cluster.test_redis_cluster::test_rediscluster_pipeline[False-expected_first_ten0]

Stack Traces | 0.09s run time

.../redis/cluster/test_redis_cluster.py:131: in test_rediscluster_pipeline
    assert span["data"] == ApproxDict(
E   assert {'thread.id': '139788412963712', 'thread.name': 'MainThread', 'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379, 'redis.commands': {'count': 0, 'first_ten': []}} == {'redis.commands': {'count': 3, 'first_ten': ["GET 'foo'", "SET 'bar' [Filtered]", "SET 'baz' [Filtered]"]}, 'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379}
E     Common items:
E     {'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379}
E     Differing items:
E     {'redis.commands': {'count': 0, 'first_ten': []}} != {'redis.commands': {'count': 3, 'first_ten': ["GET 'foo'", "SET 'bar' [Filtered]", "SET 'baz' [Filtered]"]}}
E     Left contains 2 more items:
E     {'thread.id': '139788412963712', 'thread.name': 'MainThread'}
E     Full diff:
E       {
E        'db.system': 'redis',
E     -  'redis.commands': {'count': 3,
E     ?                              ^
E     +  'redis.commands': {'count': 0,
E     ?                              ^
E     -                     'first_ten': ["GET 'foo'",
E     ?                                   ^^^^^^^^^^^
E     +                     'first_ten': []},
E     ?                                   ^^
E     -                                   "SET 'bar' [Filtered]",
E     -                                   "SET 'baz' [Filtered]"]},
E        'server.address': '127.0.0.1',
E        'server.port': 6379,
E     +  'thread.id': '139788412963712',
E     +  'thread.name': 'MainThread',
E       }

tests.integrations.redis.cluster.test_redis_cluster::test_rediscluster_pipeline[True-expected_first_ten1]

Stack Traces | 0.091s run time

.../redis/cluster/test_redis_cluster.py:131: in test_rediscluster_pipeline
    assert span["data"] == ApproxDict(
E   assert {'thread.id': '139788412963712', 'thread.name': 'MainThread', 'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379, 'redis.commands': {'count': 0, 'first_ten': []}} == {'redis.commands': {'count': 3, 'first_ten': ["GET 'foo'", "SET 'bar' 1", "SET 'baz' 2"]}, 'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379}
E     Common items:
E     {'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379}
E     Differing items:
E     {'redis.commands': {'count': 0, 'first_ten': []}} != {'redis.commands': {'count': 3, 'first_ten': ["GET 'foo'", "SET 'bar' 1", "SET 'baz' 2"]}}
E     Left contains 2 more items:
E     {'thread.id': '139788412963712', 'thread.name': 'MainThread'}
E     Full diff:
E       {
E        'db.system': 'redis',
E     -  'redis.commands': {'count': 3,
E     ?                              ^
E     +  'redis.commands': {'count': 0,
E     ?                              ^
E     -                     'first_ten': ["GET 'foo'",
E     ?                                   ^^^^^^^^^^^
E     +                     'first_ten': []},
E     ?                                   ^^
E     -                                   "SET 'bar' 1",
E     -                                   "SET 'baz' 2"]},
E        'server.address': '127.0.0.1',
E        'server.port': 6379,
E     +  'thread.id': '139788412963712',
E     +  'thread.name': 'MainThread',
E       }

tests.integrations.redis.cluster.test_redis_cluster::test_rediscluster_pipeline[True-expected_first_ten1]

Stack Traces | 0.094s run time

.../redis/cluster/test_redis_cluster.py:131: in test_rediscluster_pipeline
    assert span["data"] == ApproxDict(
E   assert {'thread.id': '140331044162432', 'thread.name': 'MainThread', 'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379, 'redis.commands': {'count': 0, 'first_ten': []}} == {'redis.commands': {'count': 3, 'first_ten': ["GET 'foo'", "SET 'bar' 1", "SET 'baz' 2"]}, 'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379}
E     Common items:
E     {'db.system': 'redis', 'server.address': '127.0.0.1', 'server.port': 6379}
E     Differing items:
E     {'redis.commands': {'count': 0, 'first_ten': []}} != {'redis.commands': {'count': 3, 'first_ten': ["GET 'foo'", "SET 'bar' 1", "SET 'baz' 2"]}}
E     Left contains 2 more items:
E     {'thread.id': '140331044162432', 'thread.name': 'MainThread'}
E     Full diff:
E       {
E        'db.system': 'redis',
E     -  'redis.commands': {'count': 3,
E     ?                              ^
E     +  'redis.commands': {'count': 0,
E     ?                              ^
E     -                     'first_ten': ["GET 'foo'",
E     ?                                   ^^^^^^^^^^^
E     +                     'first_ten': []},
E     ?                                   ^^
E     -                                   "SET 'bar' 1",
E     -                                   "SET 'baz' 2"]},
E        'server.address': '127.0.0.1',
E        'server.port': 6379,
E     +  'thread.id': '140331044162432',
E     +  'thread.name': 'MainThread',
E       }

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[antonpirker]

Nice!

[antonpirker]

see my comments, otherwise looks good!