Lambda monitoring
=================

Data for monitoring
-------------------


Now we monitor two types of events for monitoring: *request*  and *error*. First type is all requests, second is
failed requests only. Every event is a point in the time series. The point is represented as union of the following
data:

    - series name (now *requests* and *errors*)
    - start request time
    - tags, indexed data in storage, dictionary: keys - string tag names, values - string, integer, float
    - fields, non-indexed data in storage, dictionary: keys - string tag names, values - string, integer, float

*'Requests'* series. Triggered on every request. Each point contains data about corresponding request (execution time and etc).

    - tags

        +--------------+----------------------------------------------------------------------------+
        | tag name     |                                description                                 |
        +==============+============================================================================+
        | service      | always "lambda-<lambda-id>"                                                |
        +--------------+----------------------------------------------------------------------------+
        | route        | concatenation of a request method and a request resource (POST:/main)      |
        +--------------+----------------------------------------------------------------------------+
        | status_code  | http status code of response                                               |
        +--------------+----------------------------------------------------------------------------+

    - fields

        +----------------+------------------------+
        |     fields     |      description       |
        +================+========================+
        | request_id     | request id             |
        +----------------+------------------------+
        | execution_time | request execution time |
        +----------------+------------------------+

*'Errors'* series. Triggered on failed request. Each point contains *error_code* of luna error.

    - tags

        +--------------+----------------------------------------------------------------------------+
        | tag name     |                                description                                 |
        +==============+============================================================================+
        | service      | always "lambda-<lambda-id>"                                                |
        +--------------+----------------------------------------------------------------------------+
        | route        | concatenation of a request method and a request resource (POST:/main)      |
        +--------------+----------------------------------------------------------------------------+
        | status_code  | http status code of response                                               |
        +--------------+----------------------------------------------------------------------------+
        | error_code   | luna error code                                                            |
        +--------------+----------------------------------------------------------------------------+

    - fields

        +----------------+------------------------+
        |     fields     |      description       |
        +================+========================+
        | request_id     | request id             |
        +----------------+------------------------+


Database
--------

Monitoring is implemented as data sending to an `influx database <https://www.influxdata.com/products/influxdb-overview/>`_.