[mdatagen] Expose ability to see if enabled option is overridden in u…

…ser settings (open-telemetry#15344)

[mdatagen] Expose ability to see if enabled field is set in settings

This allows receiver developers to see if the default value is overridden in user settings.

.chloggen/mdatagen-optional-enabled.yaml

@@ -0,0 +1,4 @@
+change_type: enhancement
+component: cmd/mdatagen
+note: Add ability to see if `enabled` option is overridden in user settings.
+issues: [15344]

cmd/mdatagen/metrics.tmpl

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/confmap"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 	{{- if .SemConvVersion }}
@@ -20,6 +21,25 @@ import (
 // MetricSettings provides common settings for a particular metric.
 type MetricSettings struct {
 	Enabled bool `mapstructure:"enabled"`
+
+	enabledProvidedByUser bool
+}
+
+// IsEnabledProvidedByUser returns true if `enabled` option is explicitly set in user settings to any value.
+func (ms *MetricSettings) IsEnabledProvidedByUser() bool {
+	return ms.enabledProvidedByUser
+}
+
+func (ms *MetricSettings) Unmarshal(parser *confmap.Conf) error {
+	if parser == nil {
+		return nil
+	}
+	err := parser.Unmarshal(ms, confmap.WithErrorUnused())
+	if err != nil {
+		return err
+	}
+	ms.enabledProvidedByUser = parser.IsSet("enabled")
+	return nil
 }
 
 // MetricsSettings provides settings for {{ .Name }} metrics.

receiver/activedirectorydsreceiver/config_test.go

@@ -19,6 +19,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/config"
@@ -66,7 +68,9 @@ func TestLoadConfig(t *testing.T) {
 			require.NoError(t, config.UnmarshalReceiver(sub, cfg))
 
 			assert.NoError(t, cfg.Validate())
-			assert.Equal(t, tt.expected, cfg)
+			if diff := cmp.Diff(tt.expected, cfg, cmpopts.IgnoreUnexported(config.ReceiverSettings{}, metadata.MetricSettings{})); diff != "" {
+				t.Errorf("Config mismatch (-expected +actual):\n%s", diff)
+			}
 		})
 	}
 }

receiver/activedirectorydsreceiver/go.mod

@@ -3,6 +3,7 @@ module github.com/open-telemetry/opentelemetry-collector-contrib/receiver/active
 go 1.18
 
 require (
+	github.com/google/go-cmp v0.5.9
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/scrapertest v0.62.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/winperfcounters v0.62.0
 	github.com/stretchr/testify v1.8.0

receiver/dockerstatsreceiver/config_test.go

@@ -19,6 +19,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/config"
@@ -93,7 +95,9 @@ func TestLoadConfig(t *testing.T) {
 			require.NoError(t, config.UnmarshalReceiver(sub, cfg))
 
 			assert.NoError(t, cfg.Validate())
-			assert.Equal(t, tt.expected, cfg)
+			if diff := cmp.Diff(tt.expected, cfg, cmpopts.IgnoreUnexported(config.ReceiverSettings{}, metadata.MetricSettings{})); diff != "" {
+				t.Errorf("Config mismatch (-expected +actual):\n%s", diff)
+			}
 		})
 	}
 }

receiver/dockerstatsreceiver/go.mod

@@ -4,6 +4,7 @@ go 1.18
 
 require (
 	github.com/docker/docker v20.10.20+incompatible
+	github.com/google/go-cmp v0.5.9
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/containertest v0.62.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/docker v0.62.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/scrapertest v0.62.0

receiver/elasticsearchreceiver/config_test.go

@@ -19,6 +19,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/config"
@@ -194,7 +196,9 @@ func TestLoadConfig(t *testing.T) {
 			require.NoError(t, config.UnmarshalReceiver(sub, cfg))
 
 			assert.NoError(t, cfg.Validate())
-			assert.Equal(t, tt.expected, cfg)
+			if diff := cmp.Diff(tt.expected, cfg, cmpopts.IgnoreUnexported(config.ReceiverSettings{}, metadata.MetricSettings{})); diff != "" {
+				t.Errorf("Config mismatch (-expected +actual):\n%s", diff)
+			}
 		})
 	}
 }

receiver/elasticsearchreceiver/go.mod

@@ -10,6 +10,7 @@ require (
 )
 
 require (
+	github.com/google/go-cmp v0.5.9
 	github.com/hashicorp/go-version v1.6.0
 	github.com/testcontainers/testcontainers-go v0.14.0
 )