Add retry to telemetry daemon test (#768)

test/requirements.txt

@@ -9,20 +9,20 @@ certifi==2019.11.28       # via requests
 chardet==3.0.4            # via requests
 idna==2.8                 # via requests
 importlib-metadata==1.5.0  # via pluggy, pytest
-invoke==1.4.1
+invoke==1.4.1             # via -r test/requirements.in
 more-itertools==7.1.0     # via pytest
 packaging==19.0           # via pytest
 pluggy==0.13.1            # via pytest
-prometheus-client==0.7.1
+prometheus-client==0.7.1  # via -r test/requirements.in
 py==1.8.0                 # via pytest
 pyparsing==2.4.0          # via packaging
-pyserial==3.4
-pytest-timeout==1.3.4
-pytest==5.3.4
-pyyaml==5.3
-requests==2.22.0
-semver==2.9.0
-simplejson==3.17.0
+pyserial==3.4             # via -r test/requirements.in
+pytest-timeout==1.3.4     # via -r test/requirements.in
+pytest==5.3.4             # via -r test/requirements.in, pytest-timeout
+pyyaml==5.3               # via -r test/requirements.in
+requests==2.22.0          # via -r test/requirements.in
+semver==2.9.0             # via -r test/requirements.in
+simplejson==3.17.0        # via -r test/requirements.in
 six==1.12.0               # via packaging
 urllib3==1.25.8           # via requests
 wcwidth==0.1.7            # via pytest

test/test_daemon.py

@@ -20,6 +20,8 @@
 import requests
 import yaml
 from prometheus_client.parser import text_string_to_metric_families
+from requests.adapters import HTTPAdapter
+from requests.packages.urllib3.util.retry import Retry
 
 
 @pytest.mark.timeout(60)
@@ -34,7 +36,10 @@ def test_telemetry_prometheus_endpoint(daemon_runner, data_dir):
 
         # Check if :9090/metrics endpoint is alive,
         # telemetry is enabled by default in daemon mode
-        metrics = requests.get("http://localhost:9090/metrics").text
+        s = requests.Session()
+        retries = Retry(total=3, backoff_factor=1, status_forcelist=[500, 502, 503, 504])
+        s.mount('http://', HTTPAdapter(max_retries=retries))
+        metrics = s.get("http://localhost:9090/metrics").text
         family = next(text_string_to_metric_families(metrics))
         sample = family.samples[0]
         assert inventory["installation"]["id"] == sample.labels["installationID"]