Merge pull request #126 from dandi/enh-logs

Add information on SEntry and heroku logs

docs/40_development.md

@@ -86,6 +86,35 @@ controls Netlify settings. The @dandibot GitHub account is the "owner" of the
 Netlify account used for this purpose; in order to get access to that account,
 speak to @satra.
 
+## Monitoring
+
+### Service(s) status
+
+The DANDI project uses [upptime](https://upptime.js.org/) to monitor the status of DANDI provided and third-party services.
+The configuration is available in [.upptimerc.yml](https://github.com/dandi/upptime/blob/master/.upptimerc.yml) of the https://github.com/dandi/upptime repository, which is automatically updated by the upptime project pipelines.
+Upptime automatically opens new issues if any service becomes unresponsive, and closes issues whenever service comes back online.
+https://www.dandiarchive.org/upptime/ is the public dashboard for the status of DANDI services.
+
+## Logging
+
+### Sentry
+
+Sentry is used for error tracking main deployment.
+To access Sentry, login to https://dandiarchive.sentry.io .
+
+### Heroku & Papertrail
+
+The `dandi-api` and `dandi-api-staging` apps have the Papertrail add-on configured to capture logs.
+To access Papertrail, log in to the [Heroku dashboard](https://dashboard.heroku.com), proceed to the corresponding app and click on the "Papertrail" add-on.
+
+A cronjob on the `drogon` server backs up Papertrail logs as .csv files hourly at `/mnt/backup/dandi/papertrail-logs/{app}`.
+Moreover, `heroku logs` processes per app dump logs to `/mnt/backup/dandi/heroku-logs/{app}` directory.
+
+### Continuous Integration (CI) Jobs
+
+The DANDI project uses GitHub Actions for continuous integration.
+Logs for many of the repositories are archived on `drogon` server at `/mnt/backup/dandi/tinuous-logs/`.
+
 ## Code Hosting
 
 All code repositories are hosted on GitHub. The easiest way to contribute is to