Problem Statement/Rationale

Command "mongostat  -h COMMA_SEPARATED_HOST:PORTS -n 1" always resulting "TOTAL(COMMA_SEPARATED_HOST:PORTS) - 1" report entries (last host's stats output is missing)
When the host input(-h) has single host:port entry, it is giving the expected report.

Steps to Reproduce

mongostat  -h COMMA_SEPARATED_HOST:PORTS -n 1

Expected Results

mongostat comand has to show stats for all the input host:ports

Actual Results

Last host's stats are missing when -h has multiple hosts and for single iteration(-n 1)

Additional Notes

Issue: command "mongostat  -h COMMA_SEPARATED_HOST:PORTS -n 1" always resulting "TOTAL(COMMA_SEPARATED_HOST:PORTS) - 1" report entries (last host's stats output is missing)
When the host input(-h) has single host:port entry, it is giving the expected report.

Note: When mongostat command ran with '-n 2'(2 number of iterations), in the second iteration, it is giving the expected output.

Issue observing in mongo v5.0.20 FIPS (mongostat version: 100.7.5) & mongo v4.4.18 FIPS (mongostat version: 100.6.1)

In the sample output below, the number of input host:port are 6 but the report is showing only 5 host:port details.

[root@localhost ~]# mongostat --quiet $mongo_auth -o 'host,insert,query,update,delete,dirty,used,set,repl' -h sessionmgr09:27737,sessionmgr10:27747,sessionmgr11:27757,sessionmgr12:27767,sessionmgr13:27787,sessionmgr14:27717  -n 1

              host insert query update delete dirty  used          set repl
sessionmgr09:27737     *0    10   *223     *0  3.0% 77.5%        set01  SEC
sessionmgr10:27747     *0   230    230     *0  0.3% 18.6%        set02  SLV
sessionmgr11:27757     *0     1     *0     *0  1.0% 26.5%        set03  SEC
sessionmgr12:27767     *0    *0     *0     *0  0.8% 10.4%        set04  SLV
sessionmgr13:27787     *0    *0     *0     *0  0.0% 12.8%        set05  SEC

In the sample output below, the number of input host:port are 6 but the report is showing only 5 host:port details in the first iteration and in second iteration, it is showing all the 6 host:port details

[root@localhost ~]# mongostat --quiet $mongo_auth -o 'host,insert,query,update,delete,dirty,used,set,repl' -h sessionmgr09:27737,sessionmgr10:27747,sessionmgr11:27757,sessionmgr12:27767,sessionmgr13:27787,sessionmgr14:27717  -n 2

              host insert query update delete dirty  used          set repl
sessionmgr09:27737     *0     5   *149     *0  3.3% 77.3%        set01  SEC
sessionmgr10:27747     *0   229    229     20  0.3% 18.7%        set02  SLV
sessionmgr11:27757     *0     1     *0    *14  1.0% 26.5%        set03  SEC
sessionmgr12:27767     *0    *0     *0     *0  0.8% 10.4%        set04  SLV
sessionmgr13:27787     *0    *0     *0     *0  0.0% 12.8%        set05  SEC

              host insert query update delete dirty  used          set repl
sessionmgr09:27737     *0     3   *260     *0  3.4% 77.3%        set01  SEC
sessionmgr10:27747     *0   227    227      6  0.3% 18.7%        set02  SLV
sessionmgr11:27757     *0    *0     *0     *5  1.0% 26.5%        set03  SEC
sessionmgr12:27767     *0    *0     *0     *0  0.8% 10.4%        set04  SLV
sessionmgr13:27787     *0    *0     *0     *0  0.0% 12.8%        set05  SEC
sessionmgr14:27717     *0     8   *213     *0  1.8% 77.4%        set06  SEC
[root@localhost ~]#

Verbose outputs are attached