Monitoring swap

I wrote a mon script to monitor swap use because catching systems when memory use gets excessive before they go Oom is a good thing. When I deployed it I was notified of one of my servers which had 99% of the 2G of swap used but also 7G of "buff/cache" memory according to top and seemed to be running nicely like that. Would it give a better result to ignore the amount of swap in use and instead monitor the percentage of RAM used for buff/cache? -- Sent from my Huawei Mate 9 with K-9 Mail.