[mdatagen] add support for bucket boundaries

.chloggen/codeboten_move-batchprocessortest-mdatagentest.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: mdatagen
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: add support for bucket boundaries for histograms
+
+# One or more tracking issues or pull requests related to the change
+issues: [10218]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

cmd/mdatagen/internal/samplereceiver/metadata.yaml

@@ -165,6 +165,7 @@ telemetry:
       unit: s
       histogram:
         value_type: double
+        bucket_boundaries: [1, 10, 100]
     process_runtime_total_alloc_bytes:
       enabled: true
       description: Cumulative bytes allocated for heap objects (see 'go doc runtime.MemStats.TotalAlloc')

cmd/mdatagen/loader_test.go

@@ -248,6 +248,7 @@ func TestLoadMetadata(t *testing.T) {
 							Unit:        strPtr("s"),
 							Histogram: &histogram{
 								MetricValueType: MetricValueType{pmetric.NumberDataPointValueTypeDouble},
+								Boundaries:      []float64{1, 10, 100},
 							},
 						},
 						"process_runtime_total_alloc_bytes": {

cmd/mdatagen/metadata-schema.yaml

@@ -157,5 +157,7 @@ telemetry:
         value_type: <int|double>
         # Required for sum metric: whether the metric is monotonic (no negative delta values).
         monotonic: bool
+        # Bucket boundaries are only available to set for histogram metrics.
+        bucket_boundaries: [double]
       # Optional: array of attributes that were defined in the attributes section that are emitted by this metric.
       attributes: [string]

cmd/mdatagen/metricdata.go

@@ -223,7 +223,8 @@ type histogram struct {
 	Mono                   `mapstructure:",squash"`
 	MetricValueType        `mapstructure:"value_type"`
 	MetricInputType        `mapstructure:",squash"`
-	Async                  bool `mapstructure:"async,omitempty"`
+	Async                  bool      `mapstructure:"async,omitempty"`
+	Boundaries             []float64 `mapstructure:"bucket_boundaries"`
 }
 
 func (d histogram) Type() string {

cmd/mdatagen/templates/telemetry.go.tmpl

@@ -61,6 +61,9 @@ func NewTelemetryBuilder(settings component.TelemetrySettings, options ...teleme
         "{{ $name }}",
         metric.WithDescription("{{ $metric.Description }}"),
         metric.WithUnit("{{ $metric.Unit }}"),
+        {{- if eq $metric.Data.Type "Histogram" -}}
+        {{ if $metric.Data.Boundaries -}}metric.WithExplicitBucketBoundaries([]float64{ {{- range $metric.Data.Boundaries }} {{.}}, {{- end }} }...),{{- end }}
+        {{- end }}
         {{ if $metric.Data.Async -}}
         metric.With{{ casesTitle $metric.Data.BasicType }}Callback(func(_ context.Context, o metric.{{ casesTitle $metric.Data.BasicType }}Observer) error {
             o.Observe(builder.observe{{ $name.Render }}())