format and clarify alias type comment

Signed-off-by: glightfoot <glightfoot@rsglab.com>

pkg/mapper/mapper_defaults.go

@@ -16,15 +16,15 @@ package mapper
 import "time"
 
 type mapperConfigDefaults struct {
-	ObserverType        ObserverType      `yaml:"observer_type"`
-	MatchType           MatchType         `yaml:"match_type"`
-	GlobDisableOrdering bool              `yaml:"glob_disable_ordering"`
-	Ttl                 time.Duration     `yaml:"ttl"`
-	SummaryOptions      SummaryOptions    `yaml:"summary_options"`
-	HistogramOptions    HistogramOptions  `yaml:"histogram_options"`
+	ObserverType        ObserverType     `yaml:"observer_type"`
+	MatchType           MatchType        `yaml:"match_type"`
+	GlobDisableOrdering bool             `yaml:"glob_disable_ordering"`
+	Ttl                 time.Duration    `yaml:"ttl"`
+	SummaryOptions      SummaryOptions   `yaml:"summary_options"`
+	HistogramOptions    HistogramOptions `yaml:"histogram_options"`
 }
 
-// mapperConfigDefaultsAlias is used to allow deprecated fields
+// mapperConfigDefaultsAlias is used to unmarshal the yaml config into mapperConfigDefaults and allows deprecated fields
 type mapperConfigDefaultsAlias struct {
 	ObserverType        ObserverType      `yaml:"observer_type"`
 	TimerType           ObserverType      `yaml:"timer_type,omitempty"` // DEPRECATED - field only present to preserve backwards compatibility in configs

pkg/mapper/mapper_test.go

@@ -883,7 +883,7 @@ mappings:
 				},
 			},
 		},
-				{
+		{
 			testName: "Config that partially overrides default summary max_age and a default options mapping",
 			config: `---
 defaults:
@@ -1611,4 +1611,4 @@ mappings:
 		}
 	}
 
-}
+}

pkg/registry/registry.go

@@ -302,9 +302,9 @@ func (r *Registry) GetSummary(metricName string, labels prometheus.Labels, help
 		}
 
 		summaryOptions := mapper.SummaryOptions{
-			MaxAge: r.Mapper.Defaults.SummaryOptions.MaxAge,
+			MaxAge:     r.Mapper.Defaults.SummaryOptions.MaxAge,
 			AgeBuckets: r.Mapper.Defaults.SummaryOptions.AgeBuckets,
-			BufCap: r.Mapper.Defaults.SummaryOptions.BufCap,
+			BufCap:     r.Mapper.Defaults.SummaryOptions.BufCap,
 		}
 
 		if mapping != nil && mapping.SummaryOptions != nil {