feat: otlp connection span count/reset endpoints (#3533)

* feat: add new endpoint for requesting the OTLP connection test

* wip

* make ingester count spans all the time

* enable otlp ingester if connection is being tested

* implement both otlp get count spans and reset count endpoints

* revert changes used to debug feature

* revert change

* add spacing

* fix test

* extract default timeout into a const

api/config.yaml

@@ -194,3 +194,10 @@ components:
           type: array
           items:
             $ref: "./config.yaml#/components/schemas/Demo"
+    OTLPTestConnectionResponse:
+      type: object
+      properties:
+        spanCount:
+          type: integer
+        lastSpanTimestamp:
+          type: date

api/openapi.yaml

@@ -720,6 +720,32 @@ paths:
             application/json:
               schema:
                 $ref: "./config.yaml#/components/schemas/TestConnectionResponse"
+  /config/connection/otlp:
+    get:
+      tags:
+        - api
+      summary: get information about the OTLP connection
+      description: get information about the OTLP connection
+      operationId: getOTLPConnectionInformation
+      responses:
+        200:
+          description: The connection information was retrieved successfully
+          content:
+            application/json:
+              schema:
+                $ref: "./config.yaml#/components/schemas/OTLPTestConnectionResponse"
+        408:
+          description: The connection information was not available and the connection timed out
+  /config/connection/otlp/reset:
+    post:
+      tags:
+        - api
+      summary: reset the OTLP connection span count
+      description: reset the OTLP connection span count
+      operationId: resetOTLPConnectionInformation
+      responses:
+        200:
+          description: Ok
   /configs:
     get:
       tags: