### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

With `alert_type_config.llm_requests_hanging.digest: true` and `digest_interval: 86400`, we still get a new Slack message every time the hanging-request check runs (e.g., every minute), for example, 5 messages in 5 minutes with 3 replicas (in K8s). Per the [Alerting docs](https://docs.litellm.ai/docs/proxy/alerting), we expect at most one digest per instance per 24h per (alert_type, request_model, api_base).

### Steps to Reproduce

```yaml general_settings: alerting: ["slack"] alerting_threshold: 300 alert_type_config: llm_requests_hanging: digest: true digest_interval: 86400 ```

### Relevant log output

```shell

```

### What part of LiteLLM is this about?

Proxy

### What LiteLLM version are you on ?

1.80.15-stable.1

### Twitter / LinkedIn details

https://www.linkedin.com/in/t-hermann/