zalando / skipper / 10946219918
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coverage: 80.278% (+0.007%) from 80.271%
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predicates/host: add HostAny benchmark (#3239)

Current implementation uses linear probe that works well for small number
of hosts.

I thought about implementing it using map lookup but that is slower for
less than 50 hosts so I propose to only keep the benchmark that may be used
for future improvements.

Here is comparison with map-based implementation for reference:
```
              │    HEAD~1    │                 HEAD                  │
              │    sec/op    │    sec/op      vs base                │
HostAny/1-8      3.738n ± 3%    5.844n ±  3%  +56.36% (p=0.000 n=10)
HostAny/2-8      7.728n ± 4%    9.274n ±  2%  +20.02% (p=0.000 n=10)
HostAny/5-8      11.32n ± 4%    13.09n ±  4%  +15.63% (p=0.000 n=10)
HostAny/10-8     22.35n ± 3%    11.86n ± 15%  -46.94% (p=0.000 n=10)
HostAny/20-8     7.684n ± 2%   11.310n ±  9%  +47.19% (p=0.000 n=10)
HostAny/50-8     66.75n ± 4%    12.10n ± 12%  -81.87% (p=0.000 n=10)
HostAny/100-8   161.80n ± 1%    11.92n ± 13%  -92.63% (p=0.000 n=10)
geomean          17.98n         10.46n        -41.79%

              │    HEAD~1    │                HEAD                 │
              │     B/op     │    B/op     vs base                 │
HostAny/1-8     0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
HostAny/2-8     0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
HostAny/5-8     0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
HostAny/10-8    0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
HostAny/20-8    0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
HostAny/50-8    0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
HostAny/100-8   0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    ²               +0.00%                ²
¹ all samples are equal
² summaries must be >0 to compute geomean

              │    HEAD~1    │                HEAD                 │
              │  allocs/op   │ allocs/op   vs base                 │
HostAny/1-8     ... (continued)

23540 of 29323 relevant lines covered (80.28%)

104452.34 hits per line

Jobs
ID Job ID Ran Files Coverage
1 10946219918.1 0
80.28
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