Key-Based Sampling

shouldSampleKey hashes the key, so user-123 always gets the same decision.

var sampler = logly.Sampler.init(allocator, .{ .probability = 0.2 });
defer sampler.deinit();

for (users) |user| {
    if (sampler.shouldSampleKey(user)) {
        try logger.info("sampled", @src());
    }
}

Output:

user-123: skip
user-456: skip
user-789: skip