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What do the different SQL error codes emitted by Heroku Postgres mean? You have observed some SQL error codes (in the format of `sql_error_code = XXXXX`) emitted in the logs of Heroku Postgres, and are not sure what they mean.
Why am I seeing "Application Error"? You are opening your application and an "Application Error" message is displayed.
Release Phase command for a Container Registry & Runtime app in Private Space fails with R99 [Release Phase](https://devcenter.heroku.com/articles/release-phase) command consistently fails when I try to deploy a [Container Registry & Runtime](https://devcenter.heroku.com/articles/container-registry-and-runtime) app to a Private Space. Checking the app logs with the Heroku CLI command `heroku logs`, I see something like below. ``` heroku release.1234 - - Error R99 (Platform error) -> Failed to launch the dyno within 60 seconds ```
Why are my MFA codes not accepted from my Android device? You are attempting to log in using MFA codes generated by an Android device. These are being rejected as invalid, even when typed in correctly.
Why do I see "Unknown error, contact support" when viewing my application metrics? The error `Unknown error, contact support` is displayed when viewing your application metrics.
Could H10 errors ever be produced by non-web dynos? When your app's web dynos have crashed, any requests made to your app will be accompanied by an [H10 error][H10] ("App crashed") in your logs. It might sound helpful for your worker dynos to offer a similar form of notification when they have crashed. [H10]: https://devcenter.heroku.com/articles/error-codes#h10-app-crashed [H14]: https://devcenter.heroku.com/articles/error-codes#h14-no-`web`-dynos-running
“An error was encountered when contacting the add-on partner to...” error when adding an add-on. When trying to provision an add-on, you got the following error message but don’t know what it means or how to resolve it: “An error was encountered when contacting the add-on partner to [create/destroy/change to] {addon_slug}:{plan_slug}...”.
Debugging "H18 Server request interrupted" errors in NodeJS applications You're getting the H18 - Server request interrupted errors in your NodeJS applications logging and metrics.
app.json validation error: Invalid environment name: When trying to perform a build you are getting the error `app.json validation error: Invalid environment name` even though there have been no changes to your `app.json`.
Why is my app crashing with an R10 error?

Dev Center articles 3

Heroku Error Codes A description of the custom error information written to logs when your app experiences an error.
Routing in Private Spaces The routers in Private Spaces have a slightly different behavior to the routers found in the Common Runtime. This article explains the differences.
Papertrail Papertrail provides hosted log aggregation and management, including real-time tail, search, and Heroku-optimized alerts on application and platform logs. Use the native log-based metrics directly from the Heroku routing layer itself as a true measure of performance.

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