traefik/pkg/metrics/prometheus_test.go

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package metrics
import (
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"context"
"fmt"
"net/http"
"strconv"
"testing"
"time"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
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"github.com/stretchr/testify/assert"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
th "github.com/traefik/traefik/v3/pkg/testhelpers"
"github.com/traefik/traefik/v3/pkg/types"
)
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func TestRegisterPromState(t *testing.T) {
t.Cleanup(promState.reset)
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testCases := []struct {
desc string
prometheusSlice []*types.Prometheus
initPromState bool
unregisterPromState bool
expectedNbRegistries int
}{
{
desc: "Register once",
prometheusSlice: []*types.Prometheus{{}},
initPromState: true,
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unregisterPromState: false,
expectedNbRegistries: 1,
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},
{
desc: "Register once with no promState init",
prometheusSlice: []*types.Prometheus{{}},
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initPromState: false,
unregisterPromState: false,
expectedNbRegistries: 1,
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},
{
desc: "Register twice",
prometheusSlice: []*types.Prometheus{{}, {}},
initPromState: true,
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unregisterPromState: false,
expectedNbRegistries: 2,
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},
{
desc: "Register twice with no promstate init",
prometheusSlice: []*types.Prometheus{{}, {}},
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initPromState: false,
unregisterPromState: false,
expectedNbRegistries: 2,
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},
{
desc: "Register twice with unregister",
prometheusSlice: []*types.Prometheus{{}, {}},
initPromState: true,
unregisterPromState: true,
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expectedNbRegistries: 2,
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},
}
for _, test := range testCases {
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test := test
t.Run(test.desc, func(t *testing.T) {
actualNbRegistries := 0
for _, prom := range test.prometheusSlice {
if test.initPromState {
initStandardRegistry(prom)
}
if registerPromState(context.Background()) {
actualNbRegistries++
}
if test.unregisterPromState {
promRegistry.Unregister(promState)
}
promState.reset()
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}
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promRegistry.Unregister(promState)
assert.Equal(t, test.expectedNbRegistries, actualNbRegistries)
})
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}
}
func TestPrometheus(t *testing.T) {
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promState = newPrometheusState()
promRegistry = prometheus.NewRegistry()
t.Cleanup(promState.reset)
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prometheusRegistry := RegisterPrometheus(context.Background(), &types.Prometheus{
AddEntryPointsLabels: true,
AddRoutersLabels: true,
AddServicesLabels: true,
HeaderLabels: map[string]string{"useragent": "User-Agent"},
})
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defer promRegistry.Unregister(promState)
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if !prometheusRegistry.IsEpEnabled() || !prometheusRegistry.IsRouterEnabled() || !prometheusRegistry.IsSvcEnabled() {
t.Errorf("PrometheusRegistry should return true for IsEnabled(), IsRouterEnabled() and IsSvcEnabled()")
}
prometheusRegistry.ConfigReloadsCounter().Add(1)
prometheusRegistry.LastConfigReloadSuccessGauge().Set(float64(time.Now().Unix()))
prometheusRegistry.
OpenConnectionsGauge().
With("entrypoint", "test", "protocol", "TCP").
Set(1)
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prometheusRegistry.
TLSCertsNotAfterTimestampGauge().
With("cn", "value", "serial", "value", "sans", "value").
Set(float64(time.Now().Unix()))
prometheusRegistry.
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EntryPointReqsCounter().
With(map[string][]string{"User-Agent": {"foobar"}}, "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http", "entrypoint", "http").
Add(1)
prometheusRegistry.
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EntryPointReqDurationHistogram().
With("code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http", "entrypoint", "http").
Observe(1)
prometheusRegistry.
EntryPointRespsBytesCounter().
With("code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http", "entrypoint", "http").
Add(1)
prometheusRegistry.
EntryPointReqsBytesCounter().
With("code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http", "entrypoint", "http").
Add(1)
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prometheusRegistry.
RouterReqsCounter().
With(nil, "router", "demo", "service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
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Add(1)
prometheusRegistry.
RouterReqsTLSCounter().
With("router", "demo", "service", "service1", "tls_version", "foo", "tls_cipher", "bar").
Add(1)
prometheusRegistry.
RouterReqDurationHistogram().
With("router", "demo", "service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Observe(10000)
prometheusRegistry.
RouterRespsBytesCounter().
With("router", "demo", "service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
prometheusRegistry.
RouterReqsBytesCounter().
With("router", "demo", "service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
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prometheusRegistry.
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ServiceReqsCounter().
With(map[string][]string{"User-Agent": {"foobar"}}, "service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
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prometheusRegistry.
ServiceReqsTLSCounter().
With("service", "service1", "tls_version", "foo", "tls_cipher", "bar").
Add(1)
prometheusRegistry.
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ServiceReqDurationHistogram().
With("service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Observe(10000)
prometheusRegistry.
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ServiceRetriesCounter().
With("service", "service1").
Add(1)
prometheusRegistry.
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ServiceServerUpGauge().
With("service", "service1", "url", "http://127.0.0.10:80").
Set(1)
prometheusRegistry.
ServiceRespsBytesCounter().
With("service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
prometheusRegistry.
ServiceReqsBytesCounter().
With("service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
delayForTrackingCompletion()
metricsFamilies := mustScrape()
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testCases := []struct {
name string
labels map[string]string
assert func(*dto.MetricFamily)
}{
{
name: configReloadsTotalName,
assert: buildCounterAssert(t, configReloadsTotalName, 1),
},
{
name: configLastReloadSuccessName,
assert: buildTimestampAssert(t, configLastReloadSuccessName),
},
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{
name: openConnectionsName,
labels: map[string]string{
"protocol": "TCP",
"entrypoint": "test",
},
assert: buildGaugeAssert(t, openConnectionsName, 1),
},
{
name: tlsCertsNotAfterTimestampName,
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labels: map[string]string{
"cn": "value",
"serial": "value",
"sans": "value",
},
assert: buildTimestampAssert(t, tlsCertsNotAfterTimestampName),
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},
{
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name: entryPointReqsTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"entrypoint": "http",
"useragent": "foobar",
},
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assert: buildCounterAssert(t, entryPointReqsTotalName, 1),
},
{
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name: entryPointReqDurationName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"entrypoint": "http",
},
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assert: buildHistogramAssert(t, entryPointReqDurationName, 1),
},
{
name: entryPointReqsBytesTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"entrypoint": "http",
},
assert: buildCounterAssert(t, entryPointReqsBytesTotalName, 1),
},
{
name: entryPointRespsBytesTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"entrypoint": "http",
},
assert: buildCounterAssert(t, entryPointRespsBytesTotalName, 1),
},
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{
name: routerReqsTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
"router": "demo",
"useragent": "",
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},
assert: buildCounterAssert(t, routerReqsTotalName, 1),
},
{
name: routerReqsTLSTotalName,
labels: map[string]string{
"service": "service1",
"router": "demo",
"tls_version": "foo",
"tls_cipher": "bar",
},
assert: buildCounterAssert(t, routerReqsTLSTotalName, 1),
},
{
name: routerReqDurationName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
"router": "demo",
},
assert: buildHistogramAssert(t, routerReqDurationName, 1),
},
{
name: routerReqsBytesTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
"router": "demo",
},
assert: buildCounterAssert(t, routerReqsBytesTotalName, 1),
},
{
name: routerRespsBytesTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
"router": "demo",
},
assert: buildCounterAssert(t, routerRespsBytesTotalName, 1),
},
{
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name: serviceReqsTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
"useragent": "foobar",
},
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assert: buildCounterAssert(t, serviceReqsTotalName, 1),
},
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{
name: serviceReqsTLSTotalName,
labels: map[string]string{
"service": "service1",
"tls_version": "foo",
"tls_cipher": "bar",
},
assert: buildCounterAssert(t, serviceReqsTLSTotalName, 1),
},
{
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name: serviceReqDurationName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
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"service": "service1",
},
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assert: buildHistogramAssert(t, serviceReqDurationName, 1),
},
{
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name: serviceRetriesTotalName,
labels: map[string]string{
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"service": "service1",
},
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assert: buildGreaterThanCounterAssert(t, serviceRetriesTotalName, 1),
},
{
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name: serviceServerUpName,
labels: map[string]string{
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"service": "service1",
"url": "http://127.0.0.10:80",
},
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assert: buildGaugeAssert(t, serviceServerUpName, 1),
},
{
name: serviceReqsBytesTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
},
assert: buildCounterAssert(t, serviceReqsBytesTotalName, 1),
},
{
name: serviceRespsBytesTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"protocol": "http",
"service": "service1",
},
assert: buildCounterAssert(t, serviceRespsBytesTotalName, 1),
},
}
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for _, test := range testCases {
test := test
t.Run(test.name, func(t *testing.T) {
family := findMetricFamily(test.name, metricsFamilies)
if family == nil {
t.Errorf("gathered metrics do not contain %q", test.name)
return
}
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for _, label := range family.Metric[0].Label {
val, ok := test.labels[*label.Name]
if !ok {
t.Errorf("%q metric contains unexpected label %q", test.name, *label.Name)
} else if val != *label.Value {
t.Errorf("label %q in metric %q has wrong value %q, expected %q", *label.Name, test.name, *label.Value, val)
}
}
test.assert(family)
})
}
}
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func TestPrometheusMetricRemoval(t *testing.T) {
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promState = newPrometheusState()
promRegistry = prometheus.NewRegistry()
t.Cleanup(promState.reset)
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prometheusRegistry := RegisterPrometheus(context.Background(), &types.Prometheus{AddEntryPointsLabels: true, AddServicesLabels: true, AddRoutersLabels: true})
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defer promRegistry.Unregister(promState)
conf1 := dynamic.Configuration{
HTTP: th.BuildConfiguration(
th.WithRouters(
th.WithRouter("foo@providerName", th.WithServiceName("bar")),
th.WithRouter("router2", th.WithServiceName("bar@providerName")),
),
th.WithLoadBalancerServices(
th.WithService("bar@providerName", th.WithServers(
th.WithServer("http://localhost:9000"),
th.WithServer("http://localhost:9999"),
th.WithServer("http://localhost:9998"),
)),
th.WithService("service1", th.WithServers(th.WithServer("http://localhost:9000"))),
),
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),
}
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conf2 := dynamic.Configuration{
HTTP: th.BuildConfiguration(
th.WithRouters(
th.WithRouter("foo@providerName", th.WithServiceName("bar")),
),
th.WithLoadBalancerServices(
th.WithService("bar@providerName", th.WithServers(th.WithServer("http://localhost:9000"))),
),
),
}
OnConfigurationUpdate(conf1, []string{"entrypoint1", "entrypoint2"})
OnConfigurationUpdate(conf2, []string{"entrypoint1"})
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// Register some metrics manually that are not part of the active configuration.
// Those metrics should be part of the /metrics output on the first scrape but
// should be removed after that scrape.
prometheusRegistry.
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EntryPointReqsCounter().
With(nil, "entrypoint", "entrypoint2", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
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Add(1)
prometheusRegistry.
RouterReqsCounter().
With(nil, "router", "router2", "service", "bar@providerName", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
prometheusRegistry.
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ServiceReqsCounter().
With(nil, "service", "service1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
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prometheusRegistry.
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ServiceServerUpGauge().
With("service", "bar@providerName", "url", "http://localhost:9999").
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Set(1)
prometheusRegistry.
ServiceServerUpGauge().
With("service", "bar@providerName", "url", "http://localhost:9998").
Set(1)
assertMetricsExist(t, mustScrape(), entryPointReqsTotalName, routerReqsTotalName, serviceReqsTotalName, serviceServerUpName)
assertMetricsAbsent(t, mustScrape(), entryPointReqsTotalName, routerReqsTotalName, serviceReqsTotalName, serviceServerUpName)
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// To verify that metrics belonging to active configurations are not removed
// here the counter examples.
prometheusRegistry.
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EntryPointReqsCounter().
With(nil, "entrypoint", "entrypoint1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
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Add(1)
prometheusRegistry.
RouterReqsCounter().
With(nil, "router", "foo@providerName", "service", "bar", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
prometheusRegistry.
ServiceReqsCounter().
With(nil, "service", "bar@providerName", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet, "protocol", "http").
Add(1)
prometheusRegistry.
ServiceServerUpGauge().
With("service", "bar@providerName", "url", "http://localhost:9000").
Set(1)
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delayForTrackingCompletion()
assertMetricsExist(t, mustScrape(), entryPointReqsTotalName, serviceReqsTotalName, serviceServerUpName, routerReqsTotalName)
assertMetricsExist(t, mustScrape(), entryPointReqsTotalName, serviceReqsTotalName, serviceServerUpName, routerReqsTotalName)
}
func TestPrometheusMetricRemoveEndpointForRecoveredService(t *testing.T) {
promState = newPrometheusState()
promRegistry = prometheus.NewRegistry()
t.Cleanup(promState.reset)
prometheusRegistry := RegisterPrometheus(context.Background(), &types.Prometheus{AddServicesLabels: true})
defer promRegistry.Unregister(promState)
conf1 := dynamic.Configuration{
HTTP: th.BuildConfiguration(
th.WithLoadBalancerServices(
th.WithService("service1", th.WithServers(th.WithServer("http://localhost:9000"))),
),
),
}
conf2 := dynamic.Configuration{
HTTP: th.BuildConfiguration(),
}
conf3 := dynamic.Configuration{
HTTP: th.BuildConfiguration(
th.WithLoadBalancerServices(
th.WithService("service1", th.WithServers(th.WithServer("http://localhost:9001"))),
),
),
}
OnConfigurationUpdate(conf1, []string{})
OnConfigurationUpdate(conf2, []string{})
OnConfigurationUpdate(conf3, []string{})
prometheusRegistry.
ServiceServerUpGauge().
With("service", "service1", "url", "http://localhost:9000").
Add(1)
assertMetricsExist(t, mustScrape(), serviceServerUpName)
assertMetricsAbsent(t, mustScrape(), serviceServerUpName)
}
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func TestPrometheusRemovedMetricsReset(t *testing.T) {
t.Cleanup(promState.reset)
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prometheusRegistry := RegisterPrometheus(context.Background(), &types.Prometheus{AddEntryPointsLabels: true, AddServicesLabels: true})
defer promRegistry.Unregister(promState)
conf1 := dynamic.Configuration{
HTTP: th.BuildConfiguration(
th.WithLoadBalancerServices(th.WithService("service",
th.WithServers(th.WithServer("http://localhost:9000"))),
),
),
}
OnConfigurationUpdate(conf1, []string{"entrypoint1", "entrypoint2"})
OnConfigurationUpdate(dynamic.Configuration{}, nil)
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labelNamesValues := []string{
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"service", "service",
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"code", strconv.Itoa(http.StatusOK),
"method", http.MethodGet,
"protocol", "http",
}
prometheusRegistry.
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ServiceReqsCounter().
With(nil, labelNamesValues...).
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Add(3)
delayForTrackingCompletion()
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metricsFamilies := mustScrape()
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assertCounterValue(t, 3, findMetricFamily(serviceReqsTotalName, metricsFamilies), labelNamesValues...)
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// There is no dynamic configuration and so this metric will be deleted
// after the first scrape.
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assertMetricsAbsent(t, mustScrape(), serviceReqsTotalName)
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prometheusRegistry.
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ServiceReqsCounter().
With(nil, labelNamesValues...).
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Add(1)
delayForTrackingCompletion()
metricsFamilies = mustScrape()
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assertCounterValue(t, 1, findMetricFamily(serviceReqsTotalName, metricsFamilies), labelNamesValues...)
}
// reset is a utility method for unit testing.
// It should be called after each test run that changes promState internally
// in order to avoid dependencies between unit tests.
func (ps *prometheusState) reset() {
ps.dynamicConfig = newDynamicConfig()
ps.vectors = nil
ps.deletedEP = nil
ps.deletedRouters = nil
ps.deletedServices = nil
ps.deletedURLs = make(map[string][]string)
}
// Tracking and gathering the metrics happens concurrently.
// In practice this is no problem, because in case a tracked metric would miss the current scrape,
// it would just be there in the next one.
// That we can test reliably the tracking of all metrics here,
// we sleep for a short amount of time,
// to make sure the metric will be present in the next scrape.
func delayForTrackingCompletion() {
time.Sleep(250 * time.Millisecond)
}
func mustScrape() []*dto.MetricFamily {
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families, err := promRegistry.Gather()
if err != nil {
panic(fmt.Sprintf("could not gather metrics families: %s", err))
}
return families
}
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func assertMetricsExist(t *testing.T, families []*dto.MetricFamily, metricNames ...string) {
t.Helper()
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for _, metricName := range metricNames {
if findMetricFamily(metricName, families) == nil {
t.Errorf("gathered metrics should contain %q", metricName)
}
}
}
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func assertMetricsAbsent(t *testing.T, families []*dto.MetricFamily, metricNames ...string) {
t.Helper()
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for _, metricName := range metricNames {
if findMetricFamily(metricName, families) != nil {
t.Errorf("gathered metrics should not contain %q", metricName)
}
}
}
func findMetricFamily(name string, families []*dto.MetricFamily) *dto.MetricFamily {
for _, family := range families {
if family.GetName() == name {
return family
}
}
return nil
}
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func findMetricByLabelNamesValues(family *dto.MetricFamily, labelNamesValues ...string) *dto.Metric {
if family == nil {
return nil
}
for _, metric := range family.Metric {
if hasMetricAllLabelPairs(metric, labelNamesValues...) {
return metric
}
}
return nil
}
func hasMetricAllLabelPairs(metric *dto.Metric, labelNamesValues ...string) bool {
for i := 0; i < len(labelNamesValues); i += 2 {
name, val := labelNamesValues[i], labelNamesValues[i+1]
if !hasMetricLabelPair(metric, name, val) {
return false
}
}
return true
}
func hasMetricLabelPair(metric *dto.Metric, labelName, labelValue string) bool {
for _, labelPair := range metric.Label {
if labelPair.GetName() == labelName && labelPair.GetValue() == labelValue {
return true
}
}
return false
}
func assertCounterValue(t *testing.T, want float64, family *dto.MetricFamily, labelNamesValues ...string) {
t.Helper()
metric := findMetricByLabelNamesValues(family, labelNamesValues...)
if metric == nil {
t.Error("metric must not be nil")
return
}
if metric.Counter == nil {
t.Errorf("metric %s must be a counter", family.GetName())
return
}
if cv := metric.Counter.GetValue(); cv != want {
t.Errorf("metric %s has value %v, want %v", family.GetName(), cv, want)
}
}
func buildCounterAssert(t *testing.T, metricName string, expectedValue int) func(family *dto.MetricFamily) {
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t.Helper()
return func(family *dto.MetricFamily) {
if cv := int(family.Metric[0].Counter.GetValue()); cv != expectedValue {
t.Errorf("metric %s has value %d, want %d", metricName, cv, expectedValue)
}
}
}
func buildGreaterThanCounterAssert(t *testing.T, metricName string, expectedMinValue int) func(family *dto.MetricFamily) {
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t.Helper()
return func(family *dto.MetricFamily) {
if cv := int(family.Metric[0].Counter.GetValue()); cv < expectedMinValue {
t.Errorf("metric %s has value %d, want at least %d", metricName, cv, expectedMinValue)
}
}
}
func buildHistogramAssert(t *testing.T, metricName string, expectedSampleCount int) func(family *dto.MetricFamily) {
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t.Helper()
return func(family *dto.MetricFamily) {
if sc := int(family.Metric[0].Histogram.GetSampleCount()); sc != expectedSampleCount {
t.Errorf("metric %s has sample count value %d, want %d", metricName, sc, expectedSampleCount)
}
}
}
func buildGaugeAssert(t *testing.T, metricName string, expectedValue int) func(family *dto.MetricFamily) {
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t.Helper()
return func(family *dto.MetricFamily) {
if gv := int(family.Metric[0].Gauge.GetValue()); gv != expectedValue {
t.Errorf("metric %s has value %d, want %d", metricName, gv, expectedValue)
}
}
}
func buildTimestampAssert(t *testing.T, metricName string) func(family *dto.MetricFamily) {
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t.Helper()
return func(family *dto.MetricFamily) {
if ts := time.Unix(int64(family.Metric[0].Gauge.GetValue()), 0); time.Since(ts) > time.Minute {
t.Errorf("metric %s has wrong timestamp %v", metricName, ts)
}
}
}