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[Test] Scraping: check reload metrics

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Need to extend `newTestScrapeMetrics`` to get at the Registry.
`gatherLabels` function could go upstream to `client_golang`.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2024-04-10 10:38:15 +01:00
parent fc3d19725d
commit 3f6a133f26
1 changed files with 40 additions and 3 deletions
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43
scrape/scrape_test.go
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@ -65,10 +65,15 @@ func TestMain(m *testing.M) {
testutil.TolerantVerifyLeak(m)
}
func newTestScrapeMetrics(t testing.TB) *scrapeMetrics {
func newTestRegistryAndScrapeMetrics(t testing.TB) (*prometheus.Registry, *scrapeMetrics) {
reg := prometheus.NewRegistry()
metrics, err := newScrapeMetrics(reg)
require.NoError(t, err)
return reg, metrics
}
func newTestScrapeMetrics(t testing.TB) *scrapeMetrics {
_, metrics := newTestRegistryAndScrapeMetrics(t)
return metrics
}
@ -370,6 +375,7 @@ func TestScrapePoolReload(t *testing.T) {
return l
}
reg, metrics := newTestRegistryAndScrapeMetrics(t)
sp := &scrapePool{
appendable: &nopAppendable{},
activeTargets: map[uint64]*Target{},
@ -377,7 +383,7 @@ func TestScrapePoolReload(t *testing.T) {
newLoop: newLoop,
logger: nil,
client: http.DefaultClient,
metrics: newTestScrapeMetrics(t),
metrics: metrics,
symbolTable: labels.NewSymbolTable(),
}
@ -432,6 +438,12 @@ func TestScrapePoolReload(t *testing.T) {
require.Equal(t, sp.activeTargets, beforeTargets, "Reloading affected target states unexpectedly")
require.Len(t, sp.loops, numTargets, "Unexpected number of stopped loops after reload")
got, err := gatherLabels(reg, "prometheus_target_reload_length_seconds")
require.NoError(t, err)
expectedName, expectedValue := "interval", "3s"
require.Equal(t, [][]*dto.LabelPair{{{Name: &expectedName, Value: &expectedValue}}}, got)
require.Equal(t, 1.0, prom_testutil.ToFloat64(sp.metrics.targetScrapePoolReloads))
}
func TestScrapePoolReloadPreserveRelabeledIntervalTimeout(t *testing.T) {
@ -447,6 +459,7 @@ func TestScrapePoolReloadPreserveRelabeledIntervalTimeout(t *testing.T) {
}
return l
}
reg, metrics := newTestRegistryAndScrapeMetrics(t)
sp := &scrapePool{
appendable: &nopAppendable{},
activeTargets: map[uint64]*Target{
@ -460,7 +473,7 @@ func TestScrapePoolReloadPreserveRelabeledIntervalTimeout(t *testing.T) {
newLoop: newLoop,
logger: nil,
client: http.DefaultClient,
metrics: newTestScrapeMetrics(t),
metrics: metrics,
symbolTable: labels.NewSymbolTable(),
}
@ -468,6 +481,30 @@ func TestScrapePoolReloadPreserveRelabeledIntervalTimeout(t *testing.T) {
if err != nil {
t.Fatalf("unable to reload configuration: %s", err)
}
// Check that the reload metric is labeled with the pool interval, not the overridden interval.
got, err := gatherLabels(reg, "prometheus_target_reload_length_seconds")
require.NoError(t, err)
expectedName, expectedValue := "interval", "3s"
require.Equal(t, [][]*dto.LabelPair{{{Name: &expectedName, Value: &expectedValue}}}, got)
}
// Gather metrics from the provided Gatherer with specified familyName,
// and return all sets of name/value pairs.
func gatherLabels(g prometheus.Gatherer, familyName string) ([][]*dto.LabelPair, error) {
families, err := g.Gather()
if err != nil {
return nil, err
}
ret := make([][]*dto.LabelPair, 0)
for _, f := range families {
if f.GetName() == familyName {
for _, m := range f.GetMetric() {
ret = append(ret, m.GetLabel())
}
break
}
}
return ret, nil
}
func TestScrapePoolTargetLimit(t *testing.T) {