[cmd/mdatagen] Do not generate redundant reaggregation config options (#14689)

Do not generate the following metrics re-aggregation config options for
metrics that don't have any attributes that can be aggregated:
- `attributes`
- `aggregation_strategy`

Author: dmitryax

.chloggen/mdatagen-skip-reag-config-no-aggregatable-attrs.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. receiver/otlp)
+component: cmd/mdatagen
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Skip generating reaggregation config options for metrics that have no aggregatable attributes.
+
+# One or more tracking issues or pull requests related to the change
+issues: [14689]
+
+# (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: [user]

.github/workflows/utils/cspell.json

@@ -2,6 +2,7 @@
     "version": "0.2",
     "language": "en",
     "words": [
+      "aggregatable",
       "Alolita",
       "Andrzej",
       "Anoshin",

cmd/mdatagen/internal/command.go

@@ -260,6 +260,15 @@ func templatize(tmplFile string, md Metadata) *template.Template {
 					}
 					return atts
 				},
+				"hasAggregatableAttributes": func(ans []AttributeName) bool {
+					for _, an := range ans {
+						if md.Attributes[an].RequirementLevel == AttributeRequirementLevelRecommended ||
+							md.Attributes[an].RequirementLevel == AttributeRequirementLevelOptIn {
+							return true
+						}
+					}
+					return false
+				},
 				"getEventConditionalAttributes": func(attrs map[AttributeName]Attribute) []AttributeName {
 					seen := make(map[AttributeName]bool)
 					used := make([]AttributeName, 0)

cmd/mdatagen/internal/sampleconnector/internal/metadata/generated_config.go

@@ -6,7 +6,6 @@ all_set:
       attributes: ["string_attr","state","enum_attr","slice_attr","map_attr"]
     default.metric.to_be_removed:
       enabled: true
-      attributes: []
     metric.input_type:
       enabled: true
       attributes: ["string_attr","state","enum_attr","slice_attr","map_attr"]
@@ -43,7 +42,6 @@ reaggregate_set:
       attributes: []
     default.metric.to_be_removed:
       enabled: true
-      attributes: []
     metric.input_type:
       enabled: true
       attributes: []
@@ -80,7 +78,6 @@ none_set:
       attributes: ["string_attr","state","enum_attr","slice_attr","map_attr"]
     default.metric.to_be_removed:
       enabled: false
-      attributes: []
     metric.input_type:
       enabled: false
       attributes: ["string_attr","state","enum_attr","slice_attr","map_attr"]