Verify SFM Telemetry Flow
==============================================

View Collected SFM Telemetry Data using VictoriaMetrics UI (VMUI) - Cluster Mode Deployment
----------------------------------------------------------------------------------------------

To view the SFM telemetry data that is streamed to VictoriaMetrics, do the following:

1. Run the following command to verify that the VictoriaMetrics pod is running::

    kubectl get pods -n telemetry -o wide | grep vm

.. image:: ../../../images/victoria_metrics_pod_cluster_mode.png

2. Run the following command to verify that that all the services of VictoriaMetrics cluster are running::

    kubectl get service -n telemetry -o wide | grep vm

.. image:: ../../../images/victoria_metrics_service_cluster.png

3. Note the **External IP** and **port number** of the ``vmselect`` service. The external IP and port number will be used to access the VictoriaMetrics UI (VMUI).

4. Access the VMUI in a web browser using::

    https://<external vmselect loadbalancer IP>:8481/select/0/vmui

5. Filter and view telemetry metrics using queries in VMUI.
For example, the following query displays transceiver DOM temperature values::

    transceiver_dom_temperature_value

.. image:: ../../../images/victoria_metrics_dom_temperature.png

The following are some of the key metrics that can be queried:

* ``transceiver_dom_temperature_value`` - Monitors optical transceiver temperature for hardware health
* ``queue_tx_pkts`` - Tracks transmitted packets per queue for performance monitoring
* ``queue_drop_pkts`` - Counts dropped packets per queue to identify congestion issues
* ``queue_tx_bits_per_second`` - Measures queue throughput in bits per second
* ``ifcounters_in_octets`` - Monitors incoming data volume in bytes per interface
* ``ifcounters_out_octets`` - Monitors outgoing data volume in bytes per interface
* ``ifcounters_in_pkts`` - Counts incoming packets per interface
* ``ifcounters_out_pkts`` - Counts outgoing packets per interface
* ``ifcounters_in_errors`` - Tracks input errors per interface for fault detection
* ``ifcounters_out_errors`` - Tracks output errors per interface for fault detection