Revive event.name attribute (#2715)

Co-authored-by: Liudmila Molkova <[email protected]>

Author: pellared

.chloggen/2597.yaml

@@ -0,0 +1,8 @@
+change_type: enhancement
+component: event
+note: "Revive `event.name` attribute for use by non-OTLP exporters and logging libraries."
+issues: [2597]
+subtext: |
+  The `event.name` attribute is now undeprecated and can be used by:
+  - Non-OTLP exporters to emit the `EventName`
+  - Applications using existing logging libraries to add event name information that can be used to set the `EventName` field by Collector or SDK components

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -49,6 +49,7 @@ body:
         - area:elasticsearch
         - area:enduser
         - area:error
+        - area:event
         - area:exception
         - area:faas
         - area:feature-flag

.github/ISSUE_TEMPLATE/change_proposal.yaml

@@ -41,6 +41,7 @@ body:
         - area:elasticsearch
         - area:enduser
         - area:error
+        - area:event
         - area:exception
         - area:faas
         - area:feature-flag

.github/ISSUE_TEMPLATE/new-conventions.yaml

@@ -52,6 +52,7 @@ body:
         - area:elasticsearch
         - area:enduser
         - area:error
+        - area:event
         - area:exception
         - area:faas
         - area:feature-flag

docs/registry/attributes/event.md

@@ -9,4 +9,6 @@ Attributes for Events represented using Log Records.
 
 | Attribute | Type | Description | Examples | Stability |
 |---|---|---|---|---|
-| <a id="event-name" href="#event-name">`event.name`</a> | string | Identifies the class / type of event. | `browser.mouse.click`; `device.app.lifecycle` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by EventName top-level field on the LogRecord. |
+| <a id="event-name" href="#event-name">`event.name`</a> | string | Identifies the class / type of event. [1] | `browser.mouse.click`; `device.app.lifecycle` | ![Development](https://img.shields.io/badge/-development-blue) |
+
+**[1] `event.name`:** This attribute SHOULD be used by non-OTLP exporters when destination does not support `EventName` or equivalent field. This attribute MAY be used by applications using existing logging libraries so that it can be used to set the `EventName` field by Collector or SDK components.

model/event/deprecated/registry-deprecated.yaml

@@ -0,0 +1,19 @@
+groups:
+  - id: registry.event
+    type: attribute_group
+    display_name: Event Attributes
+    brief: >
+      Attributes for Events represented using Log Records.
+    attributes:
+      - id: event.name
+        type: string
+        stability: development
+        brief: >
+          Identifies the class / type of event.
+        note: >
+          This attribute SHOULD be used by non-OTLP exporters
+          when destination does not support `EventName` or equivalent field.
+          This attribute MAY be used by applications using existing logging
+          libraries so that it can be used to set the `EventName` field by
+          Collector or SDK components.
+        examples: ["browser.mouse.click", "device.app.lifecycle"]