Overhaul Monitoring Dashboard #32
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This adds some memory-based settings (shared_buffers, work_mem, maintenance_work_mem, effective_cache_size and max_wal_size), as well as some notable settings one might want to expose e.g. in Grafana dashboards like data_checksums, jit (v11+), max_worker_processes, random_page_cost, seq_page_cost and checkpoint_timeout).
This adds two rows of stat panels at the top that show key settings and values of the instance: * server version, instance uptime, bnumber of cores, total memory * max connections * memory/wal related settings * data checksums/jit settings * number of checksum failures and oom kills
* make (regular) timed checkpoints green and requested ones yellow * mention that requested checkpoints can also be wal- or backup-based * hardcode rate interval to 90s which seems to display well for most common checkpoint_timeout values * change y axis intervals to integers
Also, ignore (new) checkpoint buffers metric from Checkpoints per Minute panel.
This changes the Sequential/Index Scans panels (that reported the total number of seq/index scans per table) to the more useful Sequential Scan Tuples (i.e., how many rows were scanned per table) and Seq/Index Tuple Ratio (the ratio between sequential to index scan tuples per table).
This changes the area fill to 1 from 5 to be more in line with the other Database-related panels. For the Connections by State panel, also add a table-based legend, only show connections states that are present in the chosen time range and override the colors to be more in line with their states.
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