docs: update openapi docs

Author: alexey-yarmosh

Diff for: public/v1/components/examples.yaml

@@ -75,6 +75,14 @@ components:
             "packets": 6
           }
         }
+    createMeasurementPingLocationsMeasurementId:
+      summary: 'ping: previous measurement id'
+      value:
+        {
+          "type": "ping",
+          "target": "cdn.jsdelivr.net",
+          "locations": "1wzMrzLBZfaPoT1c"
+        }
     createMeasurementResponse:
       value:
         {

Diff for: public/v1/components/schemas.yaml

@@ -76,12 +76,14 @@ components:
           maximum: 200
           default: 1
     MeasurementLocations:
-      type: array
-      description: |
-        An array of locations from which to run the measurement.
-        Each object specifies a location using one or multiple keys.
-      items:
-        $ref: 'schemas.yaml#/components/schemas/MeasurementLocationOption'
+      oneOf:
+        - type: array
+          description: |
+            An array of locations from which to run the measurement. Each object specifies a location using one or multiple keys.
+          items:
+            $ref: 'schemas.yaml#/components/schemas/MeasurementLocationOption'
+        - type: string
+          description: Id of a previous measurement. Probes of that measurement in the same order are used to create a new measurement. Only probes are copied, measurement type and options may be any and should still be specified in request.
     MeasurementOptions:
       anyOf:
         - $ref: 'schemas.yaml#/components/schemas/MeasurementPingOptions'

Diff for: public/v1/spec.yaml

@@ -47,6 +47,7 @@ paths:
 
         - Set the `inProgressUpdates` option to `true` if the application is running in interactive mode so that the user sees the results right away.
           - If the application is interactive by default but also implements a "CI" mode to be used in scripts, do not set the flag in the CI mode.
+        - To use the same probes in different measurements pass id of the first measurement to the `locations` option.
       requestBody:
         content:
           application/json:
@@ -61,6 +62,8 @@ paths:
                 $ref: 'components/examples.yaml#/components/examples/createMeasurementPingLocationsMagic'
               pingCustom:
                 $ref: 'components/examples.yaml#/components/examples/createMeasurementPingCustom'
+              pingLocationsMeasurementId:
+                $ref: 'components/examples.yaml#/components/examples/createMeasurementPingLocationsMeasurementId'
       responses:
         '202':
           $ref: 'components/responses.yaml#/components/responses/measurements202'