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+.. ============LICENSE_START==========================================
+.. ===================================================================
+.. Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+.. ===================================================================
+.. Licensed under the Creative Commons License, Attribution 4.0 Intl.  (the "License");
+.. you may not use this documentation except in compliance with the License.
+.. You may obtain a copy of the License at
+.. 
+..  https://creativecommons.org/licenses/by/4.0/
+.. 
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS,
+.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+.. See the License for the specific language governing permissions and
+.. limitations under the License.
+.. ============LICENSE_END============================================
+.. ECOMP is a trademark and service mark of AT&T Intellectual Property.
+
+APPC Logging
+============
+
+The APPC modules manage logging functionality according to the logging
+configuration file ``org.ops4j.pax.logging.cfg``. APPC configuration defines
+the location of the logging configuration file. Each APPC module
+configured to generate logs reads the configuration file periodically
+and generates logs according to the current logging level.
+
+Logging Architecture 
+---------------------
+
+The following diagram illustrates the APPC logging architecture.
+
+|image0|
+
+Log Types
+---------
+
+APPC generates several types of logs to capture information needed to
+operate, troubleshoot, and report on performance:
+
+-  **Audit Log**: The Audit Log provides a summary view of the
+   processing of a request – a transaction – within an application. It
+   captures activity requests received by APPC and includes such
+   information as the time the activity initiated, when it finishes, and
+   the API invoked at the component.
+
+-  **Metric Log**: The Metrics Log provides a more detailed view into
+   the processing of a transaction within APP-C. It captures the
+   beginning and ending of activities necessary to complete the
+   transaction within APPC modules, for example, the Dispatcher module,
+   and other ONAP components such as A&AI.
+
+-  **Error Log**: The Error Log captures INFO, WARN, ERROR, and FATAL
+   conditions sensed (“exception handled”) by the APPC software
+   components.
+
+-  • **Debug Log**: The optional Debug Log captures data that may be required to debug and correct abnormal conditions of the application.
+
+
+The APPC modules manage logging functionality according to the logging
+configuration file ``org.ops4j.pax.logging.cfg``. APPC configuration defines
+the location of the logging configuration file. Each APPC module
+configured to generate logs reads the configuration file periodically
+and generates logs according to the current logging level.
+
+Logging Levels
+~~~~~~~~~~~~~~
+
++-------------+----------------+---------------+-------------+-------------+------------+
+| **Level**   | **Log type**                                                            |
++=============+================+===============+=============+=============+============+
+|             |                                | **Errors**                             |
++-------------+----------------+---------------+-------------+-------------+------------+
+|             | **Audit**      | **Metrics**   | **FATAL**   | **ERROR**   | **WARN**   |
++-------------+----------------+---------------+-------------+-------------+------------+
+| OFF         | No             | No            | No          | No          | No         |
++-------------+----------------+---------------+-------------+-------------+------------+
+| FATAL       | Yes            | Yes           | Yes         | No          | No         |
++-------------+----------------+---------------+-------------+-------------+------------+
+| ERROR       | Yes            | Yes           | Yes         | Yes         | No         |
++-------------+----------------+---------------+-------------+-------------+------------+
+| WARN        | Yes            | Yes           | Yes         | Yes         | Yes        |
++-------------+----------------+---------------+-------------+-------------+------------+
+
+Response Codes
+~~~~~~~~~~~~~~
+
++----------------------------+--------------------------------+
+| **Response code ranges**   | **Error type**                 |
++============================+================================+
+| 100-199                    | Permission errors              |
++----------------------------+--------------------------------+
+| 200-299                    | Availability errors/Timeouts   |
++----------------------------+--------------------------------+
+| 300-399                    | Data errors                    |
++----------------------------+--------------------------------+
+| 400-499                    | Schema errors                  |
++----------------------------+--------------------------------+
+| 500-599                    | Business process errors        |
++----------------------------+--------------------------------+
+| 900-999                    | Unknown errors                 |
++----------------------------+--------------------------------+
+
+Logging Output 
+---------------
+
+APPC generates logging output according to Event and Error Logging Framework(EELF)requirements in the
+following format:
+
+Error Log 
+~~~~~~~~~~
+
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     **Field**           |     **Description**                                                                                                                                                                                                                             |
++=========================+=================================================================================================================================================================================================================================================+
+|     Timestamp           |     Date-time when error occurs in UTC.                                                                                                                                                                                                         |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     RequestID           |     Universally unique transaction requestID (UUID).                                                                                                                                                                                            |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ThreadId            |     Blank                                                                                                                                                                                                                                       |
+|                         |                                                                                                                                                                                                                                                 |
+|                         |     This traces processing of a request over a number of threads of a single ONAP component.                                                                                                                                                    |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ServiceName         |     Externally advertised API invoked by clients of this component, for example, "Audit", "HealthCheck".                                                                                                                                        |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     PartnerName         |     Client or user invoking the API.                                                                                                                                                                                                            |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     TargetEntity        |     ONAP component/subcomponent or non-ONAP entity invoked for this suboperation’s activities, for example, A&AI, VF, VM, MySql.                                                                                                                |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     TargetServiceName   |     Known name of External API/operation activities invoked on TargetEntity (ONAP component/subcomponent or non-ONAP entity), for example, VM UUID, VF UUID.                                                                                    |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ErrorCategory       |     WARN or ERROR                                                                                                                                                                                                                               |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ErrorCode           |     Code representing the error condition according to the error categories.                                                                                                                                                                    |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ErrorDescription    |     Human readable description of the error - Error name, for example: "CONFIGURATION\_STARTED".                                                                                                                                                |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     detailMessage       |     This field may contain any additional information useful in describing the error condition, for example:                                                                                                                                    |
+|                         |                                                                                                                                                                                                                                                 |
+|                         |     ``Application Controller (APP-C) initialization started at {0}|\``                                                                                                                                                                          |
+|                         |     ``No resolution is required, this is an informational message|\``                                                                                                                                                                           |
+|                         |     ``The APP-C component configuration has been started because the component is being initialized or loaded for the first time, or a new instance of the component is being created. This message indicates that the component is starting.`` |
++-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+
+Debug Log
+~~~~~~~~~
+
++-----------------+------------------------------------------------------------+
+|     **Field**   |     **Description**                                        |
++=================+============================================================+
+| Timestamp       | Date-time of the log record.                               |
++-----------------+------------------------------------------------------------+
+| RequestID       | Universally unique transaction requestID (UUID).           |
++-----------------+------------------------------------------------------------+
+| DebugInfo       | Debug Information                                          |
++-----------------+------------------------------------------------------------+
+| End of Record   | Designates the logical end of a multi-line debug record.   |
++-----------------+------------------------------------------------------------+
+
+Audit Log
+~~~~~~~~~
+
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     **Field**                        |     **Description**                                                                                                                                                                                       |
++======================================+===========================================================================================================================================================================================================+
+|     BeginTimestamp                   |     Date-time of the start of a request activity.                                                                                                                                                         |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     EndTimestamp                     |     Date-time of the end of a request activity.                                                                                                                                                           |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     RequestID                        |     Universally unique transaction request ID (UUID).                                                                                                                                                     |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     serviceInstanceID                |     Uniquely identifies a service instance, for example, “service graph”. The primary key, for example, in A&AI, to reference or manage the service instance as a unit.                                   |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     threadId                         |     Empty                                                                                                                                                                                                 |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     physical/virtual server name     |     Empty (the value added by the log files collecting agent).                                                                                                                                            |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     serviceName                      |     Externally advertised API invoked by clients of this component, for example, "Audit", "HealthCheck".                                                                                                  |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     PartnerName                      |     Client or user invoking the API.                                                                                                                                                                      |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     StatusCode                       |     High-level success or failure of the request (COMPLETE or ERROR).                                                                                                                                     |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ResponseCode                     |     Application specific response code - LCM API error codes categorized according to the logging categories.                                                                                             |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ResponseDescription              |     Human readable description of the application specific response code, for example, "INVALID INPUT PARAMETER - ${detailedErrorMsg}".                                                                   |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     instanceUUID                     |     Universally unique identifier to differentiate between multiple instances of the same (named), log writing component - the specific APPC instance UUID.                                               |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     Category log level               |     Enum: “INFO” \| “WARN” \|”DEBUG” \| “ERROR” \| “FATAL”. Current log level for the entire APP-C.                                                                                                       |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     Severity                         |     Blank                                                                                                                                                                                                 |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     Server IP address                |     Blank                                                                                                                                                                                                 |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ElapsedTime                      |     Elapsed time to complete processing of an API or request at the granularity available to the component system. This value should be the difference between BeginTimestamp and EndTimestamp fields.    |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     Server                           |     VM FQDN if virtualized, otherwise the host name of the logging component.                                                                                                                             |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     ClientIPaddress                  |     Requesting remote client application’s IP address if known, otherwise empty.                                                                                                                          |
++--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+
+Metrics Log
+~~~~~~~~~~~
+
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|     **Field**                                 |     **Description**                                                                                                                                                                                              |
++===============================================+==================================================================================================================================================================================================================+
+| BeginTimestamp                                | Date-time when a suboperation activity is begun in UTC                                                                                                                                                           |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| EndTimestamp                                  | Date-time when a supoperation activity is completed in UTC                                                                                                                                                       |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| RequestID                                     | Universally unique transaction request ID (UUID)                                                                                                                                                                 |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| serviceInstanceID                             | VMUUID, VFUUID                                                                                                                                                                                                   |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| threadId                                      | Optional                                                                                                                                                                                                         |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| physical/virtual server name                  | Empty if its value can be added by the log files collecting agent.                                                                                                                                               |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| serviceName                                   | For example: "Audit", "HealthCheck" etc                                                                                                                                                                          |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| PartnerName Client or user invoking the API   |                                                                                                                                                                                                                  |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| TargetEntity                                  | APPC internal subcomponent, for example, MD-SAL, or external component, for example, A&AI, SSH, Netconf, invoked for this suboperation.                                                                          |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| TargetServiceName                             | Operation activities invoked on TargetEntity e.g. A&AI GET generic- vnf                                                                                                                                          |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| StatusCode                                    | High level success or failure of the suboperation activities (COMPLETE or ERROR)                                                                                                                                 |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ResponseCode                                  | Specific response code returned by the suboperation activities.                                                                                                                                                  |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ResponseDescription                           | Human readable description of the response code.                                                                                                                                                                 |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| instanceUUID                                  | APPC instance ID.                                                                                                                                                                                                |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Category log level                            | Enumerated values: “INFO” \| “WARN” \|”DEBUG” \| “ERROR” \| “FATAL”.                                                                                                                                             |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Severity                                      | Empty                                                                                                                                                                                                            |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Server IP address                             | The logging component host server’s IP address.                                                                                                                                                                  |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ElapsedTime                                   | Elapsed time to complete processing of the sub operation activities at the granularity available to the component system.  This value should be the difference between EndTimestamp and BeginTimestamp fields.   |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Server                                        | VM FQDN if virtualized, otherwise the host name of the logging component.                                                                                                                                        |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ClientIP                                      | Requesting remote client application’s IP address.                                                                                                                                                               |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| class name                                    | Optional. The name of the class that has caused the log record creation. For OO programing languages that support this concept.                                                                                  |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Unused                                        |                                                                                                                                                                                                                  |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ProcessKey                                    | Optional                                                                                                                                                                                                         |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| TargetVirtualEntity                           | Empty                                                                                                                                                                                                            |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| CustomField1                                  | Empty (specific attributes exposed by developers)                                                                                                                                                                |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| CustomField2                                  | Empty                                                                                                                                                                                                            |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| CustomField3                                  | Empty                                                                                                                                                                                                            |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| CustomField4                                  | Empty                                                                                                                                                                                                            |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| detailMessage                                 | Empty                                                                                                                                                                                                            |
++-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+
+Log File Locations
+------------------
+
+The logging configuration file, ``org.ops4j.pax.logging.cfg`` are located in
+appc Git repository:
+
+``/appc/appc-common/src/main/resources/org/openecomp/appc/org.ops4j.pax.logging.cfg``
+
+
+The logs are stored at the location defined by the appropriate appender:
+
+``log4j.appender.error.File=${karaf.data}/log/APPC/appc-error.log``
+
+``log4j.appender.debug.file=${karaf.data}/log/APPC/appc-debug.log``
+
+``log4j.appender.metric.File=${karaf.data}/log/APPC/appc-metric.log``
+
+``log4j.appender.audit.File=${karaf.data}/log/APPC/appc-audit.log``
+
+
+Enabling APPC Logging 
+----------------------
+
+APPC uses Event and Error Logging Framework (EELF) for application logs.
+To enable EELF logging:
+
+1. Replace the default configuration file located at
+   ``/opt/opendaylight/current/etc/org.ops4j.pax.logging.cfg``
+
+   with the configuration file that is checked into git:
+
+   ``/appc/appc-common/src/main/resources/org/openecomp/appc/org.ops4j.pax.logging.cfg``
+
+2. Stop and restart ODL controller for the configuration changes to take
+   effect.
+
+3. Verify logging changes at the following log paths:
+
+   -  ``/opt/opendaylight/current/data/log/eelf/karaf.log`` 
+      This log contains the regular karaf.log output reformatted to use
+      the EELF MDC properties and the pattern that is configured in the
+      ``org.ops4j.pax.logging.cfg`` file.
+   -  ``/opt/opendaylight/current/data/log/APPC/<package-name>``
+      This directory contains the audit, metric, error, and debug logs that are configured in the ``org.ops4j.pax.logging.cfg`` file.
+
+
+**Note:**
+   ``/opt/opendaylight/current/data/log/APPC/controller`` contains the logs generated from the package ``org.openecomp.\*`` (all APPC logs)
+
+-  Error.log: alarms –ERROR level logs and above
+
+-  Info.log: INFO level logs only
+
+-  Debug.log: debugging – DEBUG level and above
+
+-  Audit – AUDIT level and above
+
+Log Rotation
+------------
+
+Log rotation is performed after every 100 MB size limit is reached. The
+log rotation interval is defined as part of the EELF framework.
+
+.. |image0| image:: APPCLoggingArchitecturediagram.png 
+   :width: 6.49097in
+   :height: 3.46181in
+