Add GDS metrics package to admin app

Follows the code from the API

app/__init__.py

@@ -24,6 +24,7 @@ from flask.globals import _lookup_req_object, _request_ctx_stack
 from flask_login import LoginManager, current_user
 from flask_wtf import CSRFProtect
 from flask_wtf.csrf import CSRFError
+from gds_metrics import GDSMetrics
 from govuk_frontend_jinja.flask_ext import init_govuk_frontend
 from itsdangerous import BadSignature
 from notifications_python_client.errors import HTTPError
@@ -94,6 +95,7 @@ from app.utils import format_thousands, get_logo_cdn_domain, id_safe
 
 login_manager = LoginManager()
 csrf = CSRFProtect()
+metrics = GDSMetrics()
 
 
 # The current service attached to the request stack.
@@ -132,6 +134,7 @@ def create_app(application):
         # Gubbins
         csrf,
         login_manager,
+        metrics,
         proxy_fix,
         request_helper,
 

app/navigation.py

@@ -28,7 +28,7 @@ class Navigation:
     def endpoints_without_navigation(self):
         return tuple(
             self._get_endpoint_with_blueprint(endpoint) for endpoint in self.exclude
-        ) + ('static', 'status.show_status')
+        ) + ('static', 'status.show_status', 'metrics')
 
     def is_selected(self, navigation_item):
         if request.endpoint in self.mapping[navigation_item]:

gunicorn_config.py

@@ -4,6 +4,8 @@ import traceback
 
 import gunicorn
 
+from gds_metrics.gunicorn import child_exit  # noqa
+
 workers = 5
 worker_class = "eventlet"
 errorlog = "/home/vcap/logs/gunicorn_error.log"

manifest.yml.j2

@@ -31,6 +31,7 @@ applications:
 
     services:
       - logit-ssl-syslog-drain
+      - notify-prometheus
 
     env:
       NOTIFY_APP_NAME: admin

requirements-app.txt

@@ -25,3 +25,7 @@ itsdangerous==1.1.0
 
 git+https://github.com/alphagov/notifications-utils.git@39.7.0#egg=notifications-utils==39.7.0
 git+https://github.com/alphagov/govuk-frontend-jinja.git@v0.5.1-alpha#egg=govuk-frontend-jinja==0.5.1-alpha
+
+# gds-metrics requires prometheseus 0.2.0, override that requirement as later versions bring significant performance gains
+prometheus-client==0.8.0
+gds-metrics==0.2.0

requirements.txt

@@ -28,11 +28,15 @@ itsdangerous==1.1.0
 git+https://github.com/alphagov/notifications-utils.git@39.7.0#egg=notifications-utils==39.7.0
 git+https://github.com/alphagov/govuk-frontend-jinja.git@v0.5.1-alpha#egg=govuk-frontend-jinja==0.5.1-alpha
 
+# gds-metrics requires prometheseus 0.2.0, override that requirement as later versions bring significant performance gains
+prometheus-client==0.8.0
+gds-metrics==0.2.0
+
 ## The following requirements were added by pip freeze:
-awscli==1.18.84
+awscli==1.18.90
 bleach==3.1.4
 boto3==1.10.38
-botocore==1.17.7
+botocore==1.17.13
 cachetools==4.1.0
 certifi==2020.6.20
 chardet==3.0.4
@@ -45,7 +49,7 @@ et-xmlfile==1.0.1
 flask-redis==0.4.0
 future==0.18.2
 greenlet==0.4.16
-idna==2.9
+idna==2.10
 jdcal==1.4.1
 Jinja2==2.11.2
 jmespath==0.10.0
@@ -54,7 +58,7 @@ lxml==4.5.1
 MarkupSafe==1.1.1
 mistune==0.8.4
 monotonic==1.5
-openpyxl==3.0.3
+openpyxl==3.0.4
 orderedset==2.0.1
 phonenumbers==8.11.2
 pyasn1==0.4.8