Update HV-VES documentation - metrics

Update of documentation to cover metrics provided with use
of Prometheus library.

Change-Id: Ib81208ce80a3bfb4000781be84d1465731055551
Issue-ID: DCAEGEN2-1046
Signed-off-by: kjaniak <kornel.janiak@nokia.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/docs/sections/services/ves-hv/healthcheck-and-monitoring.rst b/docs/sections/services/ves-hv/healthcheck-and-monitoring.rst
new file mode 100644
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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+.. _healthcheck_and_monitoring:
+
+Healthcheck and Monitoring
+==========================
+
+Healthcheck
+-----------
+Inside HV-VES docker container runs a small HTTP service for healthcheck. Port for healthchecks can be configured
+at deployment using ``--health-check-api-port`` command line option or via `VESHV_HEALTHCHECK_API_PORT` environment variable (for details see :ref:`deployment`).
+
+This service exposes endpoint **GET /health/ready** which returns a **HTTP 200 OK** when HV-VES is healthy
+and ready for connections. Otherwise it returns a **HTTP 503 Service Unavailable** message with a short reason of unhealthiness.
+
+
+Monitoring
+----------
+HV-VES collector allows to collect metrics data at runtime. To serve this purpose HV-VES application exposes an endpoint **GET /monitoring/prometheus** 
+which returns a **HTTP 200 OK** message with a specific data in its body. Returned data is in a format readable by Prometheus service.
+Prometheus endpoint shares a port with healthchecks.
+
+Metrics provided by HV-VES metrics:
+
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+|           Name of metric                      |     Unit     |              Description                                                                 |
++===============================================+==============+==========================================================================================+
+| hvves_clients_rejected_cause_total            |  cause/piece | number of rejected clients grouped by cause                                              |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_clients_rejected_total                  |     piece    | total number of rejected clients                                                         |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_connections_active                      |     piece    | number of currently active connections                                                   |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_connections_total                       |     piece    | total number of connections                                                              |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_data_received_bytes_total               |     bytes    | total number of received bytes                                                           |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_disconnections_total                    |     piece    | total number of disconnections                                                           |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_messages_dropped_cause_total            |  cause/piece | number of dropped messages grouped by cause                                              |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_messages_dropped_total                  |     piece    | total number of dropped messages                                                         |
++-----------------------------------------------+--------------+-----------------------------------+------------------------------------------------------+
+| hvves_messages_latency_seconds_count          |     piece    | latency is a time between         |  counter for number of latency occurance             |
++-----------------------------------------------+--------------+ message.header.lastEpochMicrosec  +------------------------------------------------------+
+| hvves_messages_latency_seconds_max            |    seconds   | and time when data has been sent  |  maximal observed latency                            |
++-----------------------------------------------+--------------+ from HV-VES to Kafka              +------------------------------------------------------+
+| hvves_messages_latency_seconds_sum            |    seconds   |                                   |  sum of latency parameter from each message          |
++-----------------------------------------------+--------------+-----------------------------------+------------------------------------------------------+
+| hvves_messages_processing_time_seconds_count  |     piece    | processing time is time meassured |  counter for number of processing time occurance     |
++-----------------------------------------------+--------------+ between decoding of WTP message   +------------------------------------------------------+
+| hvves_messages_processing_time_seconds_max    |    seconds   | and time when data has been sent  |  maximal processing time                             |
++-----------------------------------------------+--------------+ From HV-VES to Kafka              +------------------------------------------------------+
+| hvves_messages_processing_time_seconds_sum    |    seconds   |                                   |  sum of processing time from each message            |
++-----------------------------------------------+--------------+-----------------------------------+------------------------------------------------------+
+| hvves_messages_received_payload_bytes_total   |     bytes    | total number of received payload bytes                                                   |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_messages_received_total                 |     piece    | total number of received messages                                                        |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_messages_sent_topic_total               |  topic/piece | number of sent messages grouped by topic                                                 |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+| hvves_messages_sent_total                     |     piece    | number of sent messages                                                                  |
++-----------------------------------------------+--------------+------------------------------------------------------------------------------------------+
+
+JVM metrics:
+
+- jvm_buffer_memory_used_bytes
+- jvm_classes_unloaded_total
+- jvm_gc_memory_promoted_bytes_total
+- jvm_buffer_total_capacity_bytes
+- jvm_threads_live
+- jvm_classes_loaded
+- jvm_gc_memory_allocated_bytes_total
+- jvm_threads_daemon
+- jvm_buffer_count
+- jvm_gc_pause_seconds_count
+- jvm_gc_pause_seconds_sum
+- jvm_gc_pause_seconds_max
+- jvm_gc_max_data_size_bytes
+- jvm_memory_committed_bytes
+- jvm_gc_live_data_size_bytes
+- jvm_memory_max_bytes
+- jvm_memory_used_bytes
+- jvm_threads_peak
+
+Sample response for **GET monitoring/prometheus**:
+
+.. literalinclude:: metrics_sample_response.txt