feat(filter): improve perfomance or restoreMetricStringByNameAndLabels

[almostinf]

Improve perfomance of restoreMetricStringByNameAndLabels

restoreMetricStringByNameAndLabels is called when parsing metrics, accordingly with a large volume of metrics the number of allocations and perfomance start to be greatly affected

func BenchmarkWriteStringFmt(b *testing.B) {
  var testStr string
  for i := 0; i < b.N; i++ {
    testStr = fmt.Sprintf(";%s=%s", abcde, abcdeabcde)
  }
  _ = testStr
}

func BenchmarkWriteStringPlus(b *testing.B) {
  var testStr string
  for i := 0; i < b.N; i++ {
    testStr = ";" + abcde + "=" + abcdeabcde
  }
  _ = testStr
}

func BenchmarkWriteStringBuilder(b *testing.B) {
  var testStr string
  for i := 0; i < b.N; i++ {
    builder := strings.Builder{}
    builder.WriteString(";")
    builder.WriteString(abcde)
    builder.WriteString("=")
    builder.WriteString(abcdeabcde)
    testStr = builder.String()
  }
  _ = testStr
}

And the result:

BenchmarkWriteStringFmt
BenchmarkWriteStringFmt-12               6402115               182.8 ns/op            56 B/op          3 allocs/op
BenchmarkWriteStringPlus
BenchmarkWriteStringPlus-12             22961696                49.74 ns/op           24 B/op          1 allocs/op
BenchmarkWriteStringBuilder
BenchmarkWriteStringBuilder-12          17070512                66.30 ns/op           32 B/op          2 allocs/op

[almostinf]

/build

[github-actions]

Build and push Docker images with tag: 2024-06-24.08fd9a8

[github-actions]

Build and push Docker images with tag: 2024-06-24.08fd9a8

[github-actions]

Build and push Docker images with tag: 2024-06-24.08fd9a8