# What this PR does
Runs Telegram long polling to get updates.
It's enabled by setting `FEATURE_TELEGRAM_LONG_POLLING_ENABLED=True`.
That will disable webhook and run separate deployment for telegram long
polling.
Telegram long polling is not very HA mode, but it does not need to
expose webhook url to internet and simplifies telegram integration.
## Which issue(s) this PR fixes
closes#561
## Checklist
- [x] 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)
# What this PR does
Fixes https://github.com/grafana/oncall/issues/1103, inspired by
https://github.com/grafana/oncall/pull/1934.
Makes sure that:
1. `LiveSettings.validate_settings` is only called once per update
request and not called for any individual LiveSetting instance save.
2. `telegram.Bot.set_webhook` is only called once per request when
changing `TELEGRAM_WEBHOOK_HOST`.
## Which issue(s) this PR fixes
https://github.com/grafana/oncall/issues/1103
## Checklist
- [x] 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)
