feat: metrics (#1024)

* refactor: switch from opencensus to opentelemetry

* tempo works as designed nooooot

* fix: log traceids

* with grafana agent

* fix: http tracing

* fix: cleanup files

* chore: remove todo

* fix: bad test

* fix: ignore methods in grpc interceptors

* fix: remove test log

* clean up

* typo

* fix(config): configure tracing endpoint

* fix(span): add error id to span

* feat: metrics package

* feat: metrics package

* fix: counter

* fix: metric

* try metrics

* fix: coutner metrics

* fix: active sessin counter

* fix: active sessin counter

* fix: change current Sequence table

* fix: change current Sequence table

* fix: current sequences

* fix: spooler div metrics

* fix: console view

* fix: merge master

* fix: Last spool run on search result instead of eventtimestamp

* fix: go mod

* Update console/src/assets/i18n/de.json

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

* fix: pr review

* fix: map

* update oidc pkg

* fix: handlers

* fix: value observer

* fix: remove fmt

* fix: handlers

* fix: tests

* fix: handler minimum cycle duration 1s

* fix(spooler): handler channel buffer

* fix interceptors

Co-authored-by: adlerhurst <silvan.reusser@gmail.com>
Co-authored-by: Livio Amstutz <livio.a@gmail.com>

internal/telemetry/tracing/google/google_tracer.go

@@ -0,0 +1,43 @@
+package google
+
+import (
+	"os"
+	"strings"
+
+	texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
+	"github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/telemetry/tracing"
+	"github.com/caos/zitadel/internal/telemetry/tracing/otel"
+	sdk_trace "go.opentelemetry.io/otel/sdk/trace"
+)
+
+type Config struct {
+	ProjectID    string
+	MetricPrefix string
+	Fraction     float64
+}
+
+type Tracer struct {
+	otel.Tracer
+}
+
+func (c *Config) NewTracer() error {
+	if !envIsSet() {
+		return errors.ThrowInvalidArgument(nil, "GOOGL-sdh3a", "env not properly set, GOOGLE_APPLICATION_CREDENTIALS is misconfigured or missing")
+	}
+
+	sampler := sdk_trace.ParentBased(sdk_trace.TraceIDRatioBased(c.Fraction))
+	exporter, err := texporter.NewExporter(texporter.WithProjectID(c.ProjectID))
+	if err != nil {
+		return err
+	}
+
+	tracing.T = &Tracer{Tracer: *(otel.NewTracer(c.MetricPrefix, sampler, exporter))}
+
+	return nil
+}
+
+func envIsSet() bool {
+	gAuthCred := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
+	return strings.Contains(gAuthCred, ".json")
+}