Add functional test for metrics endpoint

system/t12_api/metrics.py

@@ -0,0 +1,26 @@
+from api_lib import APITest
+
+
+class MetricsEnabledAPITest(APITest):
+    """
+    GET /metrics
+    """
+
+    def check(self):
+        resp = self.get("/api/metrics")
+        self.check_equal(resp.status_code, 200)
+
+        apiRequestsInFlightGauge = "# TYPE aptly_api_http_requests_in_flight gauge"
+        self.check_in(apiRequestsInFlightGauge, resp.text)
+
+        apiRequestsTotalCounter = "# TYPE aptly_api_http_requests_total counter"
+        self.check_in(apiRequestsTotalCounter, resp.text)
+
+        apiRequestSizeSummary = "# TYPE aptly_api_http_request_size_bytes summary"
+        self.check_in(apiRequestSizeSummary, resp.text)
+
+        apiResponseSizeSummary = "# TYPE aptly_api_http_response_size_bytes summary"
+        self.check_in(apiResponseSizeSummary, resp.text)
+
+        apiRequestsDurationSummary = "# TYPE aptly_api_http_request_duration_seconds summary"
+        self.check_in(apiRequestsDurationSummary, resp.text)