How does your team handle production logging and alerts? Is there a better approach than Teams/Slack notifications?

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I'm trying to understand how software teams monitor applications in production and investigate issues when they occur.

In our case, notifications can be sent to Microsoft Teams, but I'm curious how other teams approach this problem as applications and log volume grow.

Where do your logs go?

How do you investigate errors reported by users?

How do you monitor application health?

How do you receive alerts?

Do you rely mainly on Teams/Slack notifications, or do you use something else as your primary solution?

At what point do chat-based notifications become difficult to manage?

If you moved away from Teams/Slack-centric monitoring, what did you replace it with and why?

I'd love to hear about real-world setups, lessons learned, and tools that have worked well in production environments.