dsar is a commandline utility that collects statistics from prometheus format endpoints.
Currently it can recognise statistics from node_exporter and from the YugabyteDB server processes (tablet servers and masters).
dsar prints the statistics it is set to print (default output in the format of sar -u).
dsar stores a selection of the statistics, which it can use to plot the details of the selected statistics if it's set to create them (-g).
By default dsar will use "localhost" and port number 9100, the default node_exporter port.
The output by default is identical to the sar utility (sar on recent linux versions):
$ dsar
hostname time CPU %usr %nice %sys %iowait %steal %idle
localhost:9100:metrics 13:41:05 all 25.66 0.00 8.05 0.00 0.00 66.29
localhost:9100:metrics 13:41:06 all 24.56 0.00 8.40 0.00 0.00 67.04
localhost:9100:metrics 13:41:07 all 25.13 0.00 7.29 0.00 0.00 67.59Outside of the simple CPU percentages, it can show multiple sar and other utilities format statistics:
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sar-u (default): CPU percentages for user, nice, system, iowait, steal and idle.
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sar-u-ALL: CPU percentages for user, nice, system, iowait, steal, irq, softirq, guest, guest nice and idle.
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cpu-all: CPU time(!) for user, nice, system, iowait, steal, irq, softirq, guest, guest nice, idel, scheduler run and scheduler wait.
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yb-cpu: CPU time as accounted by the YugabyteDB tablet server and master processes, excludes the postgres layer.
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sar-d: disk device statistics: tps, rMB/s, wMB/s, areq-sz, aqu-sz, await.
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iostat: disk device statistics: tps, MB_read/s MB_wrtn/s, MB_read, MB_writn.
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iostat-x: disk device statistics: r/s, w/s, rMB/s, wMB/s, rrqm/s, wrqm/s, %rrqm/s, %wrqm/s, r_await, w_await, aqu-sz, rareq-sz, wareq-sz.
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xfs-iops: disk device statistics: XFS level (logical IO) statistics: device, W_IOPS, R_IOPS.
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yb-io: disk device statistics by the YugabyteDB tablet server and master processes, excludes the postgres layer.
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sar-n-DEV: network statistics: IFACE, rxpck/s, txpck/s, rxMB/s, txMB/s, rxcmp/s, txcmp/s, rxmcst/s.
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sar-n-EDEV: network error statistics: IFACE, rxerr/s, txerr/s, coll/s, rxdrop/s, txdrop/s, txcarr/s, rxfifo/s, txfifo/s.
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sar-n-SOCK: network socket statistics: totsck, tcpsck, udpsck, rawsck, ip-frag, tcp-tw.
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sar-n-SOCK6: network socket ipv6 statistics: tcp6sck, udp6sck, raw6sck, ip6-frag.
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sar-n-SOFT: network softnet statistics: total/s dropd/s/ squeezd/s, rx_rps/s flw_lim/s.
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yb-network: network statistics (RPC only) by the YugabyteDB tablet server and master processes, excludes the postgres layer.
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sar-S: swap statistics: mbswpfree, mbswpused, %swpused, mbswapcad, %swpcad.
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sar-W: swap IO statistics: pswpin/s, pswpout/s.
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sar-q: run statistics: runq-sz, plist-sz, ldavg-1, ldavg-5, ldavg-15, blocked.
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sar-B: paging statistics: pgpgin/s, pgpgout/s, fault/s, majflt/s.
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vmstat: virtual memory statistics: procs, memory, swap, io, system, cpu.
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sar-r: memory statistics: mbmemfree, mbavail, mbmemused, %memused, mbbuffers, mbcached, mbcommit, %commit, mbactive, mbinact, mbdirty.
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sar-r-ALL: memory statistics: mbmemfree, mbavail, mbmemused, %memused, mbbuffers, mbcached, mbcommit, %commit, mbactive, mbinact, mbdirty, mbanonpg, mbslag, mbstack, mbpgtbl, mbvmused.
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mem-relevant: total, swpcached, kernelstk, hwcorrupt, slab, pgatbls, shared, dirty, mapped, cached, anon, free, avail.
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yb-mem: memory statistics by the YugabyteDB tablet server and master processes, excludes the postgres layer.
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psi: pressure stall information: some cpu, some io, full io, some mem, full mem.
If the -g or --graph switch is added, dsar will create graphical plots of some metrics:
