[exporter/loadbalancing] add attributes details for internal telemetry (open-telemetry#39639)

This adds the attributes details to metadata.yaml for the load balancing
exporter. This uses a new version of mdatagen which hasn't landed yet.
Will update this PR from draft when
open-telemetry/opentelemetry-collector#12919 is
done.

Fixes
open-telemetry#39636

Signed-off-by: Alex Boten <[email protected]>

Author: codeboten

exporter/loadbalancingexporter/documentation.md

@@ -14,6 +14,12 @@ Response latency in ms for the backends.
 | ---- | ----------- | ---------- |
 | ms | Histogram | Int |
 
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| endpoint | The endpoint of the backend | Any Str |
+
 ### otelcol_loadbalancer_backend_outcome
 
 Number of successes and failures for each endpoint.
@@ -22,6 +28,12 @@ Number of successes and failures for each endpoint.
 | ---- | ----------- | ---------- | --------- |
 | {outcomes} | Sum | Int | true |
 
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| success | Whether an outcome was successful | Any Bool |
+
 ### otelcol_loadbalancer_num_backend_updates
 
 Number of times the list of backends was updated.
@@ -30,6 +42,12 @@ Number of times the list of backends was updated.
 | ---- | ----------- | ---------- | --------- |
 | {updates} | Sum | Int | true |
 
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| resolver | Resolver used | Str: ``aws``, ``dns``, ``k8s``, ``static`` |
+
 ### otelcol_loadbalancer_num_backends
 
 Current number of backends in use.
@@ -38,10 +56,23 @@ Current number of backends in use.
 | ---- | ----------- | ---------- |
 | {backends} | Gauge | Int |
 
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| resolver | Resolver used | Str: ``aws``, ``dns``, ``k8s``, ``static`` |
+
 ### otelcol_loadbalancer_num_resolutions
 
 Number of times the resolver has triggered new resolutions.
 
 | Unit | Metric Type | Value Type | Monotonic |
 | ---- | ----------- | ---------- | --------- |
 | {resolutions} | Sum | Int | true |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| success | Whether an outcome was successful | Any Bool |
+| resolver | Resolver used | Str: ``aws``, ``dns``, ``k8s``, ``static`` |

exporter/loadbalancingexporter/metadata.yaml

@@ -11,54 +11,75 @@ status:
     emeritus: [jpkrohling]
     seeking_new: true
 
-tests:
-  config:
-    routing_key: "service"
-    protocol:
-      otlp:
-        timeout: 1s
-    resolver:
-      static:
-        hostnames:
-          - backend-1:4317
-          - backend-2:4317
-          - backend-3:4317
-          - backend-4:4317
-  expect_consumer_error: true
+attributes:
+  success:
+    description: Whether an outcome was successful
+    type: bool
+  resolver:
+    description: Resolver used
+    type: string
+    enum:
+      - aws
+      - dns
+      - k8s
+      - static
+  endpoint:
+    description: The endpoint of the backend
+    type: string
 
 telemetry:
   metrics:
     loadbalancer_num_resolutions:
+      attributes: [success, resolver]
       enabled: true
       description: Number of times the resolver has triggered new resolutions.
       unit: "{resolutions}"
       sum:
         value_type: int
         monotonic: true
     loadbalancer_num_backends:
+      attributes: [resolver]
       enabled: true
       description: Current number of backends in use.
       unit: "{backends}"
       gauge:
         value_type: int
     loadbalancer_backend_latency:
+      attributes: [endpoint]
       enabled: true
       description: Response latency in ms for the backends.
       unit: ms
       histogram:
         value_type: int
         bucket_boundaries: [5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000]
     loadbalancer_num_backend_updates:
+      attributes: [resolver]
       enabled: true
       description: Number of times the list of backends was updated.
       unit: "{updates}"
       sum:
         value_type: int
         monotonic: true
     loadbalancer_backend_outcome:
+      attributes: [success]
       enabled: true
       description: Number of successes and failures for each endpoint.
       unit: "{outcomes}"
       sum:
         value_type: int
         monotonic: true
+    
+tests:
+  config:
+    routing_key: "service"
+    protocol:
+      otlp:
+        timeout: 1s
+    resolver:
+      static:
+        hostnames:
+          - backend-1:4317
+          - backend-2:4317
+          - backend-3:4317
+          - backend-4:4317
+  expect_consumer_error: true