fix(backend): reduce number of memory allocations

[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                           5.19ms ± 1%        5.37ms ± 2%   +3.53%  (p=0.000 n=20+20)
Decompress/Run-2                         3.49ms ± 1%        3.67ms ± 3%   +5.15%  (p=0.000 n=20+20)
CompressionAndDecompression/Run-2        9.14ms ± 4%        9.25ms ± 2%     ~     (p=0.096 n=20+20)
PullAlerts/0.17.0-2                      5.90ms ± 5%        5.77ms ± 2%   -2.28%  (p=0.005 n=20+18)
AlertsAPIMisses/0.17.0-2                 1.27ms ± 4%        1.29ms ± 3%   +1.14%  (p=0.018 n=19+20)
AlertsAPIHits/0.17.0-2                    848µs ± 1%         845µs ± 4%     ~     (p=0.055 n=20+18)
pkg:github.com/prymitive/karma/internal/alertmanager goos:linux goarch:amd64
DedupAlerts/Run-2                         134µs ± 2%         131µs ± 3%   -2.30%  (p=0.000 n=19+19)
DedupAutocomplete/Run-2                  88.8µs ± 2%        82.4µs ± 1%   -7.25%  (p=0.000 n=20+20)
DedupColors/Run-2                        20.7µs ± 1%        18.5µs ± 1%  -10.64%  (p=0.000 n=20+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%   -0.11%  (p=0.000 n=19+19)
Decompress/Run-2                          3.00M ± 0%         2.99M ± 0%   -0.28%  (p=0.000 n=20+20)
CompressionAndDecompression/Run-2         4.89M ± 0%         4.88M ± 0%   -0.11%  (p=0.000 n=20+19)
PullAlerts/0.17.0-2                       2.95M ± 0%         2.95M ± 0%   -0.26%  (p=0.000 n=20+20)
AlertsAPIMisses/0.17.0-2                  3.35M ± 0%         3.34M ± 0%   -0.23%  (p=0.000 n=19+19)
AlertsAPIHits/0.17.0-2                    3.31M ± 0%         3.31M ± 0%   -0.23%  (p=0.000 n=17+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%   -0.00%  (p=0.000 n=20+20)
CompressionAndDecompression/Run-2        5.38MB ± 0%        5.38MB ± 0%   -0.00%  (p=0.000 n=20+18)
PullAlerts/0.17.0-2                      1.30MB ± 0%        1.25MB ± 0%   -4.23%  (p=0.000 n=20+19)
AlertsAPIMisses/0.17.0-2                 1.27MB ± 0%        1.27MB ± 0%   +0.36%  (p=0.000 n=19+20)
AlertsAPIHits/0.17.0-2                    311kB ± 1%         312kB ± 1%     ~     (p=0.102 n=20+20)
pkg:github.com/prymitive/karma/internal/alertmanager goos:linux goarch:amd64
DedupAlerts/Run-2                        75.5kB ± 0%        75.9kB ± 0%   +0.52%  (p=0.000 n=20+20)
DedupAutocomplete/Run-2                  45.7kB ± 0%        39.9kB ± 0%  -12.59%  (p=0.000 n=20+19)
DedupColors/Run-2                        7.34kB ± 0%        6.28kB ± 0%  -14.49%  (p=0.000 n=17+17)

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                       22.5k ± 0%         22.3k ± 0%   -0.97%  (p=0.000 n=20+19)
AlertsAPIMisses/0.17.0-2                  5.95k ± 0%         5.92k ± 0%   -0.46%  (p=0.000 n=20+20)
AlertsAPIHits/0.17.0-2                    2.32k ± 0%         2.32k ± 0%   -0.03%  (p=0.000 n=20+20)
pkg:github.com/prymitive/karma/internal/alertmanager goos:linux goarch:amd64
DedupAlerts/Run-2                           428 ± 0%           396 ± 0%   -7.48%  (p=0.000 n=20+20)
DedupAutocomplete/Run-2                     132 ± 0%           123 ± 0%   -6.82%  (p=0.000 n=20+20)
DedupColors/Run-2                          50.0 ± 0%          43.0 ± 0%  -14.00%  (p=0.000 n=20+20)