Reduce the github_workflow_job_step_run_duration_seconds cardinality (#21)

I made a mistake and started sending the addresses in memory instead of values
for the step_number label.

THis time I remove the label completely, if we find it useful, I will introduce it properly again. but for now it is okay to drop

Author: n-srg

pkg/actionsmetrics/event_reader.go

@@ -216,9 +216,7 @@ func (reader *EventReader) ProcessWorkflowJobEvent(ctx context.Context, event in
 		if *e.WorkflowJob.Conclusion == "success" && repoName == "client" {
 			for _, step := range e.WorkflowJob.Steps {
 				stepLabels := extraLabel("step_name", *step.Name, labels)
-				stepLabels["step_number"] = fmt.Sprint(step.Number)
 				stepLabels["step_conclusion"] = *step.Conclusion
-				stepLabels["step_status"] = *step.Status
 
 				stepDuration := step.CompletedAt.Sub(step.StartedAt.Time)
 

pkg/actionsmetrics/metrics.go

@@ -154,7 +154,7 @@ func initGithubWorkflowJobStepDurationSeconds(buckets []float64) *prometheus.His
 			Help:    "Run times for the steps in workflow jobs in seconds",
 			Buckets: buckets,
 		},
-		metricLabels("step_name", "step_number", "step_conclusion", "step_status"),
+		metricLabels("step_name", "step_conclusion"),
 	)
 }