Added GET policy_ids in the agent NBI

Change-Id: I474982d9b2052f23a69247afaceb4772972057ab
Issue-ID: NONRTRIC-155
Signed-off-by: PatrikBuhr <patrik.buhr@est.tech>
diff --git a/policy-agent/docs/api.yaml b/policy-agent/docs/api.yaml
index a2f1b57..1696dad 100644
--- a/policy-agent/docs/api.yaml
+++ b/policy-agent/docs/api.yaml
@@ -425,7 +425,7 @@
         - name: type
           in: query
           description: type
-          required: true
+          required: false
           type: string
       responses:
         '200':
@@ -444,10 +444,6 @@
           description: RIC or policy type is not found
           schema:
             type: string
-        '405':
-          description: Change is not allowed
-          schema:
-            type: string
         '423':
           description: RIC is locked
           schema:
@@ -488,6 +484,46 @@
           schema:
             type: string
       deprecated: false
+  /policy_ids:
+    get:
+      tags:
+        - A1 Policy Management
+      summary: 'Query policies, only IDs returned'
+      operationId: getPolicyIdsUsingGET
+      produces:
+        - '*/*'
+      parameters:
+        - name: ric
+          in: query
+          description: ric
+          required: false
+          type: string
+        - name: service
+          in: query
+          description: service
+          required: false
+          type: string
+        - name: type
+          in: query
+          description: type
+          required: false
+          type: string
+      responses:
+        '200':
+          description: Policy ids
+          schema:
+            type: array
+            items:
+              type: string
+        '401':
+          description: Unauthorized
+        '403':
+          description: Forbidden
+        '404':
+          description: RIC or type not found
+          schema:
+            type: string
+      deprecated: false
   /policy_schema:
     get:
       tags:
@@ -762,7 +798,7 @@
     post:
       tags:
         - Service registry and supervision
-      summary: Keep the policies alive for a service
+      summary: Heartbeat from a serice
       operationId: keepAliveServiceUsingPOST
       consumes:
         - application/json
@@ -776,7 +812,7 @@
           type: string
       responses:
         '200':
-          description: Policies timeout supervision refreshed
+          description: 'Service supervision timer refreshed, OK'
           schema:
             type: string
         '201':
@@ -878,7 +914,7 @@
       keepAliveIntervalSeconds:
         type: integer
         format: int64
-        description: keep alive interval for policies owned by the service. 0 means no timeout supervision. Polcies that are not refreshed within this time are removed
+        description: 'keep alive interval for the service. This is a heartbeat supervision of the service, which in regular intevals must invoke a ''keepAlive'' REST call. When a service does not invoke this call within the given time, it is considered unavailble. An unavailable service will be automatically deregistered and its policies will be deleted. Value 0 means no timeout supervision.'
       serviceName:
         type: string
         description: identity of the service
@@ -896,7 +932,7 @@
       serviceName:
         type: string
         description: identity of the service
-      timeSincePingSeconds:
+      timeSinceLastActivitySeconds:
         type: integer
         format: int64
         description: time since last invocation by the service