In the search query provided, what will appear on the Y-axis when using this search: sourcetype=access_combined status!=200 | chart count over host?

The Y-axis in the search query results from the chart command will display the count of events, as specified in the query. When using the chart count over host, the query is aggregating the total number of events for each unique value of the host field that matches the search criteria.

The count is the primary metric being calculated and visualized on the Y-axis, representing how many events were recorded. This is essential because the purpose of the chart command is to summarize data; here, it focuses on counting occurrences for each host that has a status field value not equal to 200.

The remaining options don't correspond with the data being visualized on the Y-axis. 'Host' is utilized on the X-axis to differentiate between different hosts, while 'Status' is a filter applied in the search and doesn't directly represent a visual metric in the output. 'Event' refers to an instance of data within the logs but is not a summarized value that gets plotted on the Y-axis in this specific query context.

Thus, the accurate representation of the Y-axis will indeed show the count of events for each distinct host that meets the specified criteria.