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.. _telemetry:
OpenMetrics
-----------
OpenMetrics specifies the de-facto standard for transmitting cloud-native
metrics at scale, with support for both text representation and Protocol
Buffers.
RFC
~~~
- RFC2119
- RFC5234
- RFC8174
- draft-richih-opsawg-openmetrics-00
Reference
~~~~~~~~~
`OpenMetrics <https://github.com/OpenObservability/OpenMetrics/blob/master/specification/OpenMetrics.md>`_
Metric Types
~~~~~~~~~~~~
- Gauge
- Counter
- StateSet
- Info
- Histogram
- GaugeHistogram
- Summary
- Unknown
Telemetry module in CSIT currently support only Gauge, Counter and Info.
Example metric file
~~~~~~~~~~~~~~~~~~~
::
# HELP calls_total Number of calls total
# TYPE calls_total counter
calls_total{name="api-rx-from-ring",state="active",thread_id="0",thread_lcore="1",thread_name="vpp_main"} 0.0
calls_total{name="fib-walk",state="any wait",thread_id="0",thread_lcore="1",thread_name="vpp_main"} 0.0
calls_total{name="ip6-mld-process",state="any wait",thread_id="0",thread_lcore="1",thread_name="vpp_main"} 0.0
calls_total{name="ip6-ra-process",state="any wait",thread_id="0",thread_lcore="1",thread_name="vpp_main"} 0.0
calls_total{name="unix-epoll-input",state="polling",thread_id="0",thread_lcore="1",thread_name="vpp_main"} 39584.0
calls_total{name="avf-0/18/6/0-output",state="active",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="avf-0/18/6/0-tx",state="active",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="avf-input",state="polling",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="ethernet-input",state="active",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="ip4-input-no-checksum",state="active",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="ip4-lookup",state="active",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="ip4-rewrite",state="active",thread_id="1",thread_lcore="2",thread_name="vpp_wk_0"} 91.0
calls_total{name="avf-0/18/2/0-output",state="active",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="avf-0/18/2/0-tx",state="active",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="avf-input",state="polling",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="ethernet-input",state="active",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="ip4-input-no-checksum",state="active",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="ip4-lookup",state="active",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="ip4-rewrite",state="active",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 91.0
calls_total{name="unix-epoll-input",state="polling",thread_id="2",thread_lcore="0",thread_name="vpp_wk_1"} 1.0
Anatomy of existing CSIT telemetry implementation
-------------------------------------------------
Existing implementation consists of several measurment building blocks:
the main measuring block running search algorithms (MLR, PLR, SOAK, MRR, ...),
the latency measuring block and the several telemetry blocks with or without
traffic running on a background.
The main measuring block must not be interrupted by any read operation that can
impact data plane traffic processing during throughput search algorithm. Thus
operational reads are done before (pre-stat) and after (post-stat) that block.
Some operational reads must be done while traffic is running and usually
consists of two reads (pre-run-stat, post-run-stat) with defined delay between
them.
MRR measurement
~~~~~~~~~~~~~~~
::
traffic_start(r=mrr) traffic_stop |< measure >|
| | | (r=mrr) |
| pre_run_stat post_run_stat | pre_stat | | post_stat
| | | | | | | |
--o--------o---------------o---------o-------o--------+-------------------+------o------------>
t
Legend:
- pre_run_stat
- vpp-clear-runtime
- post_run_stat
- vpp-show-runtime
- bash-perf-stat // if extended_debug == True
- pre_stat
- vpp-clear-stats
- vpp-enable-packettrace // if extended_debug == True
- vpp-enable-elog
- post_stat
- vpp-show-stats
- vpp-show-packettrace // if extended_debug == True
- vpp-show-elog
::
|< measure >|
| (r=mrr) |
| |
|< traffic_trial0 >|< traffic_trial1 >|< traffic_trialN >|
| (i=0,t=duration) | (i=1,t=duration) | (i=N,t=duration) |
| | | |
--o------------------------o------------------------o------------------------o--->
t
MLR measurement
~~~~~~~~~~~~~~~
::
|< measure >| traffic_start(r=pdr) traffic_stop traffic_start(r=ndr) traffic_stop |< [ latency ] >|
| (r=mlr) | | | | | | .9/.5/.1/.0 |
| | | pre_run_stat post_run_stat | | pre_run_stat post_run_stat | | |
| | | | | | | | | | | |
--+-------------------+----o--------o---------------o---------o--------------o--------o---------------o---------o------------[---------------------]--->
t
Legend:
- pre_run_stat
- vpp-clear-runtime
- post_run_stat
- vpp-show-runtime
- bash-perf-stat // if extended_debug == True
- pre_stat
- vpp-clear-stats
- vpp-enable-packettrace // if extended_debug == True
- vpp-enable-elog
- post_stat
- vpp-show-stats
- vpp-show-packettrace // if extended_debug == True
- vpp-show-elog
Improving existing solution
---------------------------
Improving existing CSIT telemetry implementaion including these areas.
- telemetry optimization
- reducing ssh overhead
- removing stats without added value
- telemetry scheduling
- improve accuracy
- improve configuration
- telemetry output
- standardize output
Exesting stats implementation was abstracted to having pre-/post-run-stats
phases. Improvement will be done by merging pre-/post- logic implementation into
separated stat-runtime block configurable and locally executed on SUT.
This will increase precision, remove complexity and move implementation into
spearated module.
OpenMetric format for cloud native metric capturing will be used to ensure
integration with post processing module.
MRR measurement
~~~~~~~~~~~~~~~
::
traffic_start(r=mrr) traffic_stop |< measure >|
| | | (r=mrr) |
| |< stat_runtime >| | stat_pre_trial | | stat_post_trial
| | | | | | | |
----o---+--------------------------+---o-------------o------------+-------------------+-----o------------->
t
Legend:
- stat_runtime
- vpp-runtime
- stat_pre_trial
- vpp-clear-stats
- vpp-enable-packettrace // if extended_debug == True
- stat_post_trial
- vpp-show-stats
- vpp-show-packettrace // if extended_debug == True
::
|< measure >|
| (r=mrr) |
| |
|< traffic_trial0 >|< traffic_trial1 >|< traffic_trialN >|
| (i=0,t=duration) | (i=1,t=duration) | (i=N,t=duration) |
| | | |
--o------------------------o------------------------o------------------------o--->
t
::
|< stat_runtime >|
| |
|< program0 >|< program1 >|< programN >|
| (@=params) | (@=params) | (@=params) |
| | | |
--o------------------------o------------------------o------------------------o--->
t
MLR measurement
~~~~~~~~~~~~~~~
::
|< measure >| traffic_start(r=pdr) traffic_stop traffic_start(r=ndr) traffic_stop |< [ latency ] >|
| (r=mlr) | | | | | | .9/.5/.1/.0 |
| | | |< stat_runtime >| | | |< stat_runtime >| | | |
| | | | | | | | | | | |
--+-------------------+-----o---+--------------------------+---o--------------o---+--------------------------+---o-----------[---------------------]--->
t
Legend:
- stat_runtime
- vpp-runtime
- stat_pre_trial
- vpp-clear-stats
- vpp-enable-packettrace // if extended_debug == True
- stat_post_trial
- vpp-show-stats
- vpp-show-packettrace // if extended_debug == True
|
