generate semconv v1.21.0 (#9056)

The template needed an update to work. I can split that change out or
keep it here.

---------

Signed-off-by: Alex Boten <aboten@lightstep.com>

.chloggen/codeboten_gensemconv-1.21.0.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: semconv
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Generated Semantic conventions 1.21.
+
+# One or more tracking issues or pull requests related to the change
+issues: [9056]
+
+# (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: []

semconv/template.j2

@@ -36,6 +36,9 @@ Examples: {{ attr.examples | pprint | trim("[]")  }}
 Note: {{ attr.note | render_markdown(paragraph="{0}", code="{0}", link="{1}", emphasis="{0}", strong="{0}") }}
 {%- endif %}
 {%- endmacro -%}
+{%- macro sentence_case(text) -%}
+    {{ text[0]|upper}}{{text[1:] }}
+{%- endmacro -%}
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
@@ -45,7 +48,7 @@ package semconv
 
 {% for semconv in semconvs -%}
 {%- if semconvs[semconv].attributes | rejectattr("ref") | selectattr("is_local") | sort(attribute=fqn) | length > 0 -%}
-// {{ semconvs[semconv].brief }}
+// {{ sentence_case(semconvs[semconv].brief | replace("This document defines ", "")) | wordwrap(76, break_long_words=false, break_on_hyphens=false, wrapstring="\n// ") }}
 const (
 {% for attr in semconvs[semconv].attributes if attr.is_local and not attr.ref -%}
     // {{ godoc(attr) | wordwrap | indent(3) | replace("   ", "\t// ") | replace("// //", "//") }}

semconv/v1.21.0/doc.go

@@ -0,0 +1,9 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Package semconv implements OpenTelemetry semantic conventions.
+//
+// OpenTelemetry semantic conventions are agreed standardized naming
+// patterns for OpenTelemetry things. This package represents the v1.21.0
+// version of the OpenTelemetry semantic conventions.
+package semconv // import "go.opentelemetry.io/collector/semconv/v1.21.0"