Sure! Here's an example of how to use SPL, the search and reporting language used in SPLunk, to search for events in the last hour that contain the keyword "error":

```python
index=myapp sourcetype=error | stats count by hour
```
This query searches for events in the "myapp" index with a "sourcetype" of "error". It then filters the results to only include events that occurred in the last hour, and groups the count of events by hour.

You can then use this information to identify the most problematic hour for errors to better understand and fix the issue.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence