Merge pull request #4114 from alphagov/trial-sentry-180766893

Trial running Sentry in a Flask app

application.py

@@ -1,7 +1,20 @@
+import os
+
+import sentry_sdk
 from flask import Flask
+from sentry_sdk.integrations.flask import FlaskIntegration
 
 from app import create_app
 
+sentry_sdk.init(
+    dsn=os.environ['SENTRY_DSN'],
+    integrations=[FlaskIntegration()],
+    environment=os.environ['NOTIFY_ENVIRONMENT'],
+    attach_stacktrace=True,
+    traces_sample_rate=0.00005  # avoid exceeding rate limits in Production
+)
+sentry_sdk.set_level('error')  # only record error logs or exceptions
+
 application = Flask('app')
 
 create_app(application)

requirements.in

@@ -41,3 +41,5 @@ cryptography<3.4 # pyup: ignore
 # version 0.10.0 introduced exceptions when workers crashed due to deprecating lower case `prometheus_multiproc_dir`.
 prometheus-client>=0.9.0,!=0.10.0
 gds-metrics==0.2.4
+
+sentry-sdk[flask]

requirements.txt

@@ -18,6 +18,7 @@ blinker==1.4
     # via
     #   -r requirements.in
     #   gds-metrics
+    #   sentry-sdk
 boto3==1.17.84
     # via notifications-utils
 botocore==1.20.84
@@ -31,6 +32,7 @@ certifi==2021.5.30
     # via
     #   pyproj
     #   requests
+    #   sentry-sdk
 cffi==1.14.5
     # via cryptography
 chardet==4.0.0
@@ -65,6 +67,7 @@ flask==1.1.2
     #   flask-wtf
     #   gds-metrics
     #   notifications-utils
+    #   sentry-sdk
 flask-login==0.5.0
     # via -r requirements.in
 flask-redis==0.4.0
@@ -198,6 +201,8 @@ s3transfer==0.4.2
     # via
     #   awscli
     #   boto3
+sentry-sdk[flask]==1.5.1
+    # via -r requirements.in
 shapely==1.7.1
     # via
     #   -r requirements.in
@@ -220,6 +225,7 @@ urllib3==1.26.5
     # via
     #   botocore
     #   requests
+    #   sentry-sdk
 webencodings==0.5.1
     # via bleach
 werkzeug==2.0.2