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Various improvements and refactoring

Mateusz Piotrowski requested to merge 0mp/prometheus-exporter-for-zfs:klara into main

Most notable changes in this MR are:

  • Change the port to 9200 to avoid a conflict with Node Exporter
  • Capture and export objset metrics
  • Refactor the code base in general
  • Rename the exporter to "Prometheus Exporter For ZFS" so that we can have a nice, unique prefix of "pe4zfs" for all the metrics
  • Remove disk metrics; these can be obtained from other exporters like https://github.com/prometheus/procfs or Node Exporter.
  • Do not use /pool_stats from procfs to get statistics about pools. This interface is gone in newer releases of OpenZFS.
  • Remove metrics related to TXGs (transaction groups). We'll introduce them back again later when we figure out that right way of exposing information about them.
  • Currently exposed metrics are:
    • zfs_version
    • allocated_bytes
    • capacity_ratio
    • fragmentation_ratio
    • free_bytes
    • size_bytes
    • read_errors_total
    • write_errors_total
    • checksum_errors_total
    • dmu_tx_dirty_throttle
    • dmu_tx_dirty_delay
    • dmu_tx_dirty_over_max
    • dmu_tx_dirty_frees_delay
    • dmu_tx_quota
    • dmu_tx_memory_reserve
    • dmu_tx_memory_reclaim
    • memory_throttle_count
    • hits
    • misses
    • mru_ghost_hits
    • mfu_ghost_hits
    • writes
    • nwritten
    • reads
    • nread
    • nunlinks
    • nunlinked
    • avail
    • used
    • refer
    • usedsnap
    • usedds
    • usedrefreserv
    • usedchild
    • reserv
    • quota

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