Memory leak about pihole-exporter HOT 4 OPEN

Hi.

Just discovered the same issue in my environment and wanted to check if there is maybe an update on this issue

Here a Graph for the last 21Days of a pihole instance which is unused, but the memory definitely looks unhealthy

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Pihole exporter is constantly getting oomkilled in my cluster as well.

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Just chiming in with my own experiences - if left unchecked, I eventually get TCP out of memory errors. pihole-exporter running in docker) is definitely the culprit - I consistently get these messages in dmesg when I start to see performance issuesL

[1440872.938303] TCP: out of memory -- consider tuning tcp_mem
[1440872.938308] Out of memory: Kill process 31698 (pihole-exporter) score 173 or sacrifice child
[1440872.938509] Killed process 31698 (pihole-exporter) total-vm:1549048kB, anon-rss:422384kB, file-rss:0kB, shmem-rss:0kB
[1440873.167398] oom_reaper: reaped process 31698 (pihole-exporter), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

Have done some more tuning on my tcp kerneral parameters, but the silver bullet has been a several times daily restart of the pihole-exporter container.

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I believe this #157 might fix the above.
For me it was manifesting itself has a SiGSEV error with "too may open files"

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