This adds a new metric exposing per target scrape sample_limit value. Metrics are only exposed if extra-scrape-metrics feature flag is enabled.
scrape_sample_limit will make it easy to monitor and alert on targets getting close to configured sample_limit, which is important given than exceeding sample_limit results in the entire scrape results being rejected.
Signed-off-by: Łukasz Mierzwa <l.mierzwa@gmail.com>
Add a new built-in metric `scrape_timeout_seconds` to allow monitoring
of the ratio of scrape duration to the scrape timeout. Hide behind a
feature flag to avoid additional cardinality by default.
Signed-off-by: SuperQ <superq@gmail.com>
* Allow VectorSelector.String() without matchers
Previously this method was panicking because it was trying to allocate a
slice with capacity -1. There's nothing saying that VectorSelector
should have matchers, and it's actually prepared to have zero matcher
strings, so it's worth checking instead of panicking.
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
Update build to use Go 1.17.
* Use golang-builder images for testing.
* Update CircleCI go orb.
* Use tools from golang-builder image.
Signed-off-by: SuperQ <superq@gmail.com>
This change sets the scheme to https when a rule specified by Ingress
matches a wildcard DNS entry in the ingress TLS hosts
Signed-off-by: Philip Gough <philip.p.gough@gmail.com>
While implementing a different feature, I found that Labels.Get() was
performing a linear search. I wondered whether it would perform any
better with a binary search approach, and wrote a benchmark: the answer
is that it's probably doesn't worth it, so I just decided to leave the
benchmark and the results for the next reader.
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Use global string map for MatchType.String()
We were unnecessarily creating a new map for each call of String().
This is a 10x improvement in MatchType.String() performance in time,
from 53ns to 4ns on my i7 laptop, and I guess that this method is being
called quite often so why throw out the resources.
I was surprised that benchmark says that there are no allocations made
in the old version.
I also tries using `//go:generate stringer` and the result is even
better, at about 2.8ns, but having to keep the generated code updated
isn't worth the change (at least it's bigger than a small change I was
intended to do)
Benchmark comparison:
name \ time/op old global_map stringer
MatchType_String 53.6ns ± 1% 4.1ns ± 1% 2.8ns ± 1%
name \ alloc/op old global_map stringer
MatchType_String 0.00B 0.00B 0.00B
name \ allocs/op old global_map stringer
MatchType_String 0.00 0.00 0.00
Old benchmark:
goos: darwin
goarch: amd64
pkg: github.com/prometheus/prometheus/pkg/labels
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
BenchmarkMatchType_String 21766578 54.36 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 21742339 53.28 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 21985470 53.37 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 21676282 53.50 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 22075573 53.33 ns/op 0 B/op 0 allocs/op
PASS
ok github.com/prometheus/prometheus/pkg/labels 6.252s
New with global map:
goos: darwin
goarch: amd64
pkg: github.com/prometheus/prometheus/pkg/labels
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
BenchmarkMatchType_String 283412692 4.129 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 294859941 4.091 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 295750158 4.113 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 282827982 4.072 ns/op 0 B/op 0 allocs/op
BenchmarkMatchType_String 292942393 4.047 ns/op 0 B/op 0 allocs/op
PASS
ok github.com/prometheus/prometheus/pkg/labels 8.238s
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Use array instead of map
Since MatchType is an iota type, we can safely use an array here.
This solution is even better:
name \ time/op old global_map stringer array
MatchType_String 53.6ns ± 1% 4.1ns ± 1% 2.8ns ± 1% 1.0ns ± 1%
name \ alloc/op old global_map stringer array
MatchType_String 0.00B 0.00B 0.00B 0.00B
name \ allocs/op old global_map stringer array
MatchType_String 0.00 0.00 0.00 0.00
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Benchmark all MatchType values
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* Use constants for limits
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
