1. False. The platform metrics that are emitted by Azure are defined by every individual service and cannot be changed.
2. 93 days. This number guarantees that there is always at least 3 months of history.
3. True. Custom metrics can be calculated in your own application code and emitted to Application Insights through the SDK or REST API.
4. Alert fatigue.
5. True. Azure allows for the creation of action groups that can contain webhooks to be called in response to an alert being raised.