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* feat(limit): add new limit package with bucket Add a new limit package with generic bucket implementation. This can be used for example to limit the number of alerts in memory. Benchmarks: ```go goos: darwin goarch: arm64 pkg: github.com/prometheus/alertmanager/limit cpu: Apple M3 Pro BenchmarkBucketUpsert/EmptyBucket-12 8816954 122.4 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsert/AddToFullBucketWithExpiredItems-12 9861010 123.0 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsert/AddToFullBucketWithActiveItems-12 8343778 143.6 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsert/UpdateExistingAlert-12 10107787 118.9 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsert/MixedWorkload-12 9436174 126.0 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsertScaling/BucketSize_10-12 10255278 115.4 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsertScaling/BucketSize_50-12 10166518 117.1 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsertScaling/BucketSize_100-12 10457394 115.0 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsertScaling/BucketSize_500-12 9644079 115.2 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsertScaling/BucketSize_1000-12 10426184 116.6 ns/op 56 B/op 2 allocs/op BenchmarkBucketUpsertConcurrent-12 5796210 216.3 ns/op 406 B/op 5 allocs/op PASS ok github.com/prometheus/alertmanager/limit 15.497s ``` Signed-off-by: Siavash Safi <siavash@cloudflare.com> * feat(provider): implement per-alert limits Use the new limit module to add optional per alert-name limits. The metrics for limited alerts can be enabled using `alerts-limited-metric` feature flag. Signed-off-by: Siavash Safi <siavash@cloudflare.com> --------- Signed-off-by: Siavash Safi <siavash@cloudflare.com>