# What this PR does
Introduces BaseFailed exception for phone_notificator.
# Why
We need to somehow distinguish errors we want to be notified - like
network errors or invalid twilio credentials (I will call them "real"
errors) and errors we want to share with user, but don't want to be
paged ( I will call them "fake" errors).
To do that I added "graceful_msg" to all Failed... exceptions. If
details field is present - it mean we can return 400 code with the
message, if not - 500 code. So, "real" errors will raise Failed...
exception, while "fake" will add "graceful_msg".
# TODO
handle exceptions handled here
https://github.com/grafana/oncall/pull/2065
## Checklist
- [ ] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
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Co-authored-by: Michael Derynck <michael.derynck@grafana.com>
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