fix: cAdvisor validation model

Author: zeroc0d3

internal/collector/cadvisor/cadvisor.go

@@ -40,13 +40,6 @@ import (
 
 const collectorName = "cadvisor"
 
-func init() {
-	// prometheus/common v0.67+ requires an explicit validation scheme.
-	// Without this, TextParser.TextToMetricFamilies panics with
-	// "Invalid name validation scheme requested: unset".
-	model.NameValidationScheme = model.LegacyValidation
-}
-
 // CAdvisorCollector scrapes container metrics from a cAdvisor Prometheus endpoint.
 // It implements the collector.Collector interface.
 type CAdvisorCollector struct {
@@ -213,8 +206,9 @@ func (c *CAdvisorCollector) Collect(ctx context.Context) ([]collector.Metric, er
 }
 
 // parsePrometheusText parses Prometheus text format from a reader.
+// Uses LegacyValidation to support traditional metric names (e.g., container_cpu_usage_seconds_total).
 func parsePrometheusText(r io.Reader) (map[string]*dto.MetricFamily, error) {
-	var parser expfmt.TextParser
+	parser := expfmt.NewTextParser(model.LegacyValidation)
 	return parser.TextToMetricFamilies(r)
 }
 

internal/collector/scraper/parser.go

@@ -25,6 +25,7 @@ import (
 
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
 
 	"github.com/telemetryflow/telemetryflow-agent/internal/collector"
 )
@@ -40,7 +41,7 @@ import (
 //	HISTOGRAM→ MetricTypeHistogram (one metric per bucket + _sum + _count)
 //	SUMMARY  → MetricTypeSummary   (one metric per quantile + _sum + _count)
 func parsePrometheusText(r io.Reader) ([]collector.Metric, error) {
-	var parser expfmt.TextParser
+	parser := expfmt.NewTextParser(model.LegacyValidation)
 	families, err := parser.TextToMetricFamilies(r)
 	if err != nil {
 		// TextToMetricFamilies returns a partial result alongside the error;