fix(api): count silences per cluster, not instance

[prymitive]

No description provided.

[prymitive]

Go benchmark diff

name                               old time/op        new time/op        delta
pkg:github.com/prymitive/karma/cmd/karma goos:linux goarch:amd64
Compress/Run-2                           5.22ms ± 2%        5.25ms ± 3%    ~     (p=0.101 n=19+20)
Decompress/Run-2                         3.74ms ± 2%        3.72ms ± 4%    ~     (p=0.627 n=19+20)
CompressionAndDecompression/Run-2        9.63ms ± 5%        9.52ms ± 2%    ~     (p=0.142 n=20+20)
PullAlerts/0.17.0-2                      5.94ms ± 3%        5.90ms ± 4%    ~     (p=0.234 n=19+19)
AlertsAPIMisses/0.17.0-2                 1.35ms ± 4%        1.35ms ± 2%    ~     (p=0.191 n=19+19)
AlertsAPIHits/0.17.0-2                    899µs ± 3%         893µs ± 2%    ~     (p=0.107 n=20+19)
pkg:github.com/prymitive/karma/internal/alertmanager goos:linux goarch:amd64
DedupAlerts/Run-2                         132µs ± 3%         130µs ± 1%  -1.30%  (p=0.001 n=20+20)
DedupAutocomplete/Run-2                  85.1µs ± 2%        85.2µs ± 2%    ~     (p=0.461 n=20+19)
DedupColors/Run-2                        18.5µs ± 1%        18.7µs ± 1%  +1.20%  (p=0.000 n=16+20)

name                               old %/compression  new %/compression  delta
pkg:github.com/prymitive/karma/cmd/karma goos:linux goarch:amd64
Compress/Run-2                             0.04 ± 0%          0.04 ± 0%    ~     (all equal)

name                               old B/alloc        new B/alloc        delta
pkg:github.com/prymitive/karma/cmd/karma goos:linux goarch:amd64
Compress/Run-2                            4.88M ± 0%         4.88M ± 0%  -0.02%  (p=0.000 n=19+19)
Decompress/Run-2                          2.99M ± 0%         3.00M ± 0%    ~     (p=0.621 n=20+19)
CompressionAndDecompression/Run-2         4.89M ± 0%         4.89M ± 0%    ~     (p=0.730 n=20+20)
PullAlerts/0.17.0-2                       2.94M ± 0%         2.94M ± 0%  -0.01%  (p=0.000 n=19+19)
AlertsAPIMisses/0.17.0-2                  3.34M ± 0%         3.34M ± 0%  -0.01%  (p=0.000 n=19+19)
AlertsAPIHits/0.17.0-2                    3.30M ± 0%         3.30M ± 0%  -0.02%  (p=0.000 n=18+17)

name                               old alloc/op       new alloc/op       delta
pkg:github.com/prymitive/karma/cmd/karma goos:linux goarch:amd64
Compress/Run-2                           1.13MB ± 0%        1.13MB ± 0%    ~     (all equal)
Decompress/Run-2                         4.24MB ± 0%        4.24MB ± 0%    ~     (p=0.377 n=20+19)
CompressionAndDecompression/Run-2        5.38MB ± 0%        5.38MB ± 0%  -0.00%  (p=0.013 n=19+17)
PullAlerts/0.17.0-2                      1.26MB ± 0%        1.26MB ± 0%    ~     (p=0.380 n=20+20)
AlertsAPIMisses/0.17.0-2                 1.29MB ± 0%        1.29MB ± 0%  -0.12%  (p=0.038 n=20+20)
AlertsAPIHits/0.17.0-2                    311kB ± 1%         311kB ± 1%    ~     (p=0.158 n=20+18)
pkg:github.com/prymitive/karma/internal/alertmanager goos:linux goarch:amd64
DedupAlerts/Run-2                        75.9kB ± 0%        75.9kB ± 0%    ~     (p=0.856 n=20+20)
DedupAutocomplete/Run-2                  40.3kB ± 0%        40.3kB ± 0%    ~     (p=0.504 n=20+20)
DedupColors/Run-2                        6.28kB ± 0%        6.28kB ± 0%    ~     (all equal)

name                               old allocs/op      new allocs/op      delta
pkg:github.com/prymitive/karma/cmd/karma goos:linux goarch:amd64
Compress/Run-2                             31.0 ± 0%          31.0 ± 0%    ~     (all equal)
Decompress/Run-2                           80.0 ± 0%          80.0 ± 0%    ~     (all equal)
CompressionAndDecompression/Run-2           111 ± 0%           111 ± 0%    ~     (all equal)
PullAlerts/0.17.0-2                       22.4k ± 0%         22.4k ± 0%    ~     (all equal)
AlertsAPIMisses/0.17.0-2                  5.98k ± 0%         5.98k ± 0%  -0.01%  (p=0.006 n=16+20)
AlertsAPIHits/0.17.0-2                    2.35k ± 0%         2.35k ± 0%    ~     (p=0.191 n=20+20)
pkg:github.com/prymitive/karma/internal/alertmanager goos:linux goarch:amd64
DedupAlerts/Run-2                           396 ± 0%           396 ± 0%    ~     (all equal)
DedupAutocomplete/Run-2                     131 ± 0%           131 ± 0%    ~     (all equal)
DedupColors/Run-2                          43.0 ± 0%          43.0 ± 0%    ~     (all equal)