Forum Discussion
Bobbybobby
Altostratus
AltostratusGTM - Metric Timers
Can someone that is really familiar with GTM LS metrics help me understand the difference between these configuration settings. Their descriptions and default seconds seems to overlap/conflict. Pa...
Hi Bobbybobby ,
You can run
tmsh show net cmetrics
Are you using Prometheus or docker images to export GTM metrics.
Could you please share your scenario for using GTM metrics.
Metric values are cached only when a session is active, only when requested, and only when the value is no longer considered useful (fresh). Consider these factors when viewing Metrics, especially when trending.
path-ttl
Specifies the number of seconds that the system considers path
data to be valid for name resolution and load balancing purposes.
The default value is 2400. Note that this option must be greater
than the paths-retry option and less than or equal to 2419200 (28
days).
inactive-paths-ttl
Specifies the number of seconds that a path remains in the cache
after its last access. Valid values are 60 - 31536000 (1 year).
The default value is 604800 (7 days).
metrics-caching
Specifies the interval (in seconds) at which the system dumps path
and other metrics data. Valid values are 0 through 604800. The
default value is 3600; 0 (zero) turns this feature off.
inactive-ldns-ttl
Specifies the number of seconds that an inactive LDNS remains in
the cache. Each time an LDNS makes a request, the clock starts
again. Valid values are 60 - 31536000 (1 year). The default value
is 2419200 (28 days).
Please refer to
https://clouddocs.f5.com/cli/tmsh-reference/v14/modules/gtm/gtm_global-settings_general.html
https://clouddocs.f5.com/cli/tmsh-reference/v15/modules/gtm/gtm_global-settings_metrics.html
https://support.f5.com/csp/article/K9629
https://support.f5.com/csp/article/K14938
BobbybobbyHi F5_Design_Engineer ,
I am not trying to export the data.
The issue is their is a conflict between the metric-caching definition and the remaining definitions even as you laid out. If the cache is being removed per the metrics-caching every 3600s by default, then some of the other values (ie inactive-ttl with a default value of 604800) will never be reached hence it seems pointless. That is unless the definitions of "the path" and "path metrics" means two different things. And if they do mean different things, what are those specific differences?