Default value to -62135596800 corresponding to 0001-01-01 when no process found

[maziadi]

Hi. I noticed that when no process $MY_PROCESS is running then the metric namedprocess_namegroup_oldest_start_time_seconds{groupname="$MY_PROCESS"} shows value -62135596800 corresponding to 0001-01-01.

• https://github.com/ncabatoff/process-exporter/blob/master/proc/grouper.go#L63
• https://github.com/ncabatoff/process-exporter/blob/master/proc/grouper.go#L81-L83
• https://github.com/ncabatoff/process-exporter/blob/master/proc/tracker.go#L84

Example:

curl -s 127.0.0.1:10081/metrics | grep -i "\-6.21355968e+10"
namedprocess_namegroup_oldest_start_time_seconds{groupname="http"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="https"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="identify"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="inkscape"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="joe"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="jpegtran"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="localedef"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="logger"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="logrotate"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="mv"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="ndtrack"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="osqueryi"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="perl"} -6.21355968e+10
namedprocess_namegroup_oldest_start_time_seconds{groupname="php"} -6.21355968e+10