Give metric attributes unique names

From experimentation, it seems that attributes of the same name in
different metrics are shared. This leads to, for example, alert status
types showing up in the remediation graph.

internal/engine/metrics.go

@@ -89,8 +89,8 @@ func (e *ExecutorMetrics) CountEvalStatus(
 	entityType db.Entities,
 ) {
 	e.evalCounter.Add(ctx, 1, metric.WithAttributes(
-		attribute.String("entity_type", string(entityType)),
-		attribute.String("status", string(status)),
+		attribute.String("eval_entity_type", string(entityType)),
+		attribute.String("eval_status_type", string(status)),
 	))
 }
 
@@ -100,7 +100,7 @@ func (e *ExecutorMetrics) CountRemediationStatus(
 	status db.RemediationStatusTypes,
 ) {
 	e.evalCounter.Add(ctx, 1, metric.WithAttributes(
-		attribute.String("status", string(status)),
+		attribute.String("remediation_status_type", string(status)),
 	))
 }
 
@@ -110,7 +110,7 @@ func (e *ExecutorMetrics) CountAlertStatus(
 	status db.AlertStatusTypes,
 ) {
 	e.evalCounter.Add(ctx, 1, metric.WithAttributes(
-		attribute.String("status", string(status)),
+		attribute.String("alert_status_type", string(status)),
 	))
 }