Explicitly stop the Exporter when main routines are done.

[jaqx0r]

The Exporter and HTTPServer are not connected by channels to the Runtime,
only indirectly through mutating effects on the Store. As such we can't rely on
the Exporter to shut down automatically when the Runtime shuts down.

Here instead we remove the WaitGroup and allow an Exporter to be shut down
explicitly after the WaitGroup is Done.

Issue: #331

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⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 2.

Benchmark suite	Current: 64c82f4	Previous: 28136c2	Ratio
BenchmarkStore/Add	2309 ns/op	821.1 ns/op	2.81
BenchmarkStore/Add	4430 ns/op	821.1 ns/op	5.40
BenchmarkStore/Add	8757 ns/op	821.1 ns/op	10.66
BenchmarkStore/Add	17096 ns/op	821.1 ns/op	20.82
BenchmarkStore/Add	34693 ns/op	821.1 ns/op	42.25
BenchmarkStore/Add	75768 ns/op	821.1 ns/op	92.28
BenchmarkStore/Add	146179 ns/op	821.1 ns/op	178.03
BenchmarkStore/Add	307868 ns/op	821.1 ns/op	374.95
BenchmarkStore/Add	628667 ns/op	821.1 ns/op	765.64
BenchmarkStore/AddParallel	2310 ns/op	815.3 ns/op	2.83
BenchmarkStore/AddParallel	4489 ns/op	815.3 ns/op	5.51
BenchmarkStore/AddParallel	8717 ns/op	815.3 ns/op	10.69
BenchmarkStore/AddParallel	17338 ns/op	815.3 ns/op	21.27
BenchmarkStore/AddParallel	34501 ns/op	815.3 ns/op	42.32
BenchmarkStore/AddParallel	70698 ns/op	815.3 ns/op	86.71
BenchmarkStore/AddParallel	150548 ns/op	815.3 ns/op	184.65
BenchmarkStore/AddParallel	312142 ns/op	815.3 ns/op	382.86
BenchmarkStore/AddParallel	625977 ns/op	815.3 ns/op	767.79
BenchmarkStore/AddWithGc	6221 ns/op	2444 ns/op	2.55
BenchmarkStore/AddWithGc	10789 ns/op	2444 ns/op	4.41
BenchmarkStore/AddWithGc	19554 ns/op	2444 ns/op	8.00
BenchmarkStore/AddWithGc	38313 ns/op	2444 ns/op	15.68
BenchmarkStore/AddWithGc	77764 ns/op	2444 ns/op	31.82
BenchmarkStore/AddWithGc	155124 ns/op	2444 ns/op	63.47
BenchmarkStore/AddWithGc	314152 ns/op	2444 ns/op	128.54
BenchmarkStore/AddWithGc	651627 ns/op	2444 ns/op	266.62
BenchmarkStore/AddWithGcParallel	2303 ns/op	818.7 ns/op	2.81
BenchmarkStore/AddWithGcParallel	4453 ns/op	818.7 ns/op	5.44
BenchmarkStore/AddWithGcParallel	8822 ns/op	818.7 ns/op	10.78
BenchmarkStore/AddWithGcParallel	17144 ns/op	818.7 ns/op	20.94
BenchmarkStore/AddWithGcParallel	35898 ns/op	818.7 ns/op	43.85
BenchmarkStore/AddWithGcParallel	71355 ns/op	818.7 ns/op	87.16
BenchmarkStore/AddWithGcParallel	145633 ns/op	818.7 ns/op	177.88
BenchmarkStore/AddWithGcParallel	302984 ns/op	818.7 ns/op	370.08
BenchmarkStore/AddWithGcParallel	615102 ns/op	818.7 ns/op	751.32
BenchmarkStore/Iterate	732.6 ns/op	361.4 ns/op	2.03
BenchmarkStore/Iterate	1125 ns/op	361.4 ns/op	3.11
BenchmarkStore/Iterate	1908 ns/op	361.4 ns/op	5.28
BenchmarkStore/Iterate	3580 ns/op	361.4 ns/op	9.91
BenchmarkStore/Iterate	6930 ns/op	361.4 ns/op	19.18
BenchmarkStore/Iterate	13490 ns/op	361.4 ns/op	37.33
BenchmarkStore/IterateParallel	707.7 ns/op	336.5 ns/op	2.10
BenchmarkStore/IterateParallel	1097 ns/op	336.5 ns/op	3.26
BenchmarkStore/IterateParallel	1874 ns/op	336.5 ns/op	5.57
BenchmarkStore/IterateParallel	3443 ns/op	336.5 ns/op	10.23
BenchmarkStore/IterateParallel	6796 ns/op	336.5 ns/op	20.20
BenchmarkStore/IterateParallel	13628 ns/op	336.5 ns/op	40.50
BenchmarkStore/IterateWithGc	3885 ns/op	1883 ns/op	2.06
BenchmarkStore/IterateWithGc	5434 ns/op	1883 ns/op	2.89
BenchmarkStore/IterateWithGc	9623 ns/op	1883 ns/op	5.11
BenchmarkStore/IterateWithGc	17464 ns/op	1883 ns/op	9.27
BenchmarkStore/IterateWithGc	31327 ns/op	1883 ns/op	16.64
BenchmarkStore/IterateWithGcParallel	704.7 ns/op	336.9 ns/op	2.09
BenchmarkStore/IterateWithGcParallel	1092 ns/op	336.9 ns/op	3.24
BenchmarkStore/IterateWithGcParallel	1911 ns/op	336.9 ns/op	5.67
BenchmarkStore/IterateWithGcParallel	3577 ns/op	336.9 ns/op	10.62
BenchmarkStore/IterateWithGcParallel	6830 ns/op	336.9 ns/op	20.27
BenchmarkStore/IterateWithGcParallel	13530 ns/op	336.9 ns/op	40.16
BenchmarkMetric/GetDatum	2986 ns/op	776.4 ns/op	3.85
BenchmarkMetric/GetDatum	5673 ns/op	776.4 ns/op	7.31
BenchmarkMetric/GetDatum	11174 ns/op	776.4 ns/op	14.39
BenchmarkMetric/GetDatum	22645 ns/op	776.4 ns/op	29.17
BenchmarkMetric/GetDatum	48426 ns/op	776.4 ns/op	62.37
BenchmarkMetric/GetDatum	105998 ns/op	776.4 ns/op	136.52
BenchmarkMetric/GetDatum	242224 ns/op	776.4 ns/op	311.98
BenchmarkMetric/GetDatum	518683 ns/op	776.4 ns/op	668.06
BenchmarkMetric/GetDatum	1016170 ns/op	776.4 ns/op	1308.82
BenchmarkMetric/GetDatum	2108739 ns/op	776.4 ns/op	2716.05
BenchmarkMetric/GetDatum	4580140 ns/op	776.4 ns/op	5899.20
BenchmarkMetric/GetDatumParallel	2682 ns/op	912.2 ns/op	2.94
BenchmarkMetric/GetDatumParallel	6078 ns/op	912.2 ns/op	6.66
BenchmarkMetric/GetDatumParallel	12027 ns/op	912.2 ns/op	13.18
BenchmarkMetric/GetDatumParallel	22918 ns/op	912.2 ns/op	25.12
BenchmarkMetric/GetDatumParallel	48172 ns/op	912.2 ns/op	52.81
BenchmarkMetric/GetDatumParallel	111217 ns/op	912.2 ns/op	121.92
BenchmarkMetric/GetDatumParallel	245329 ns/op	912.2 ns/op	268.94
BenchmarkMetric/GetDatumParallel	522054 ns/op	912.2 ns/op	572.30
BenchmarkMetric/GetDatumParallel	1027080 ns/op	912.2 ns/op	1125.94
BenchmarkMetric/GetDatumParallel	2152733 ns/op	912.2 ns/op	2359.94
BenchmarkMetric/GetDatumParallel	5037450 ns/op	912.2 ns/op	5522.31

This comment was automatically generated by workflow using github-action-benchmark.

[github-actions]

Unit Test Results

    1 files     27 suites   8m 52s ⏱️
  648 tests   647 ✅ 1 💤 0 ❌
1 917 runs  1 914 ✅ 3 💤 0 ❌

Results for commit 64c82f4.