--- /dev/null
+---
+bookToc: false
+title: "Telemetry"
+weight: 20
+---
+
+# Telemetry
+
+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.
+
+## Anatomy of 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
+
+
+## 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
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