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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Logging
+=======
+
+Logging is controlled by the configuration provided to **SNMPTRAP** by CBS,
+or via the fallback config file specified as the environment
+variable "CBS_SIM_JSON" at startup.  The section of that JSON configuration
+that influences the various forms of application logging is referenced
+throughout this document, with examples.
+
+Using the JSON configuration, a base directory is specified for application
+data and EELF log files.  Specific filenames (again, from the JSON
+config) are appended to the base directory value to create a full-path
+filename for use by SNMPTRAP.
+
+Also available is the ability to modify how frequently logs are rolled to
+time-stamped versions (and a new empty file is started) as well as what
+severity level to log to program diagnostic logs.  Files will be rolled to
+an archived/timestamped version hourly.  The actual archival (to a
+timestamped filename) occurs when the first trap is
+received **in a new hour** (or minute, or day - depending
+on "roll_frequency" value).
+
+Defaults are shown below:
+
+.. code-block:: json
+
+    "files": {
+        <other json data>
+        ...
+        "roll_frequency": "hour",
+        "minimum_severity_to_log": 2
+        <other json data>
+        ...
+    },
+
+
+Where to Access Information: APPLICATION DATA (TRAPS)
+-----------------------------------------------------
+
+APPLICATION DATA (TRAPS)
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+**SNMPTRAP** produces application-specific logs (e.g. trap logs/payloads,
+etc) as well as various other statistical and diagnostic logs.  The
+location of these logs is controlled by the JSON config, using these
+values:
+
+.. code-block:: json
+
+    "files": {
+        "**runtime_base_dir**": "/opt/app/snmptrap",
+        "log_dir": "logs",
+        "data_dir": "data",
+        "pid_dir": "tmp",
+        "arriving_traps_log": "snmptrapd_arriving_traps.log",
+        "snmptrapd_diag": "snmptrapd_prog_diag.log",
+        "traps_stats_log": "snmptrapd_stats.csv",
+        "perm_status_file": "snmptrapd_status.log",
+        "roll_frequency": "hour",
+        "minimum_severity_to_log": 2
+        <other json data>
+        ...
+    },
+
+The base directory for all data logs is specified with:
+
+    **runtime_base_dir**
+
+Remaining log file references are appended to the *runtime_base_dir*
+value to specify a logfile location.  The result using the
+above example would create the files:
+
+.. code-block:: bash
+
+    /opt/app/snmptrap/logs/snmptrapd_arriving_traps.log
+    /opt/app/snmptrap/logs/snmptrapd_prog_diag.log
+    /opt/app/snmptrap/logs/snmptrapd_stats.csv
+    /opt/app/snmptrap/logs/snmptrapd_status.log
+
+
+ARRIVING TRAPS
+^^^^^^^^^^^^^^^
+
+**SNMPTRAP** logs all arriving traps.  These traps are saved in a
+filename created by appending *runtime_base_dir*, *log_dir*
+and *arriving_traps_log* from the JSON config.  Using the example
+above, the resulting arriving trap log would be:
+
+.. code-block:: bash
+
+    /opt/app/snmptrap/logs/snmptrapd_arriving_traps.log
+
+An example from this log is shown below:
+
+.. code-block:: none
+
+    1529960544.4896748 Mon Jun 25 17:02:24 2018; Mon Jun 25 17:02:24 2018 com.att.dcae.dmaap.IST3.DCAE-COLLECTOR-UCSNMP 15299605440000 1.3.6.1.4.1.999.0.1 server001 127.0.0.1 server001 v2c 751564798 0f40196a-78bb-11e8-bac7-005056865aac , "varbinds": [{"varbind_oid": "1.3.6.1.4.1.999.0.1.1", "varbind_type": "OctetString", "varbind_value": "TEST TRAP"}]
+
+*(Add:  varbind type enumerations)*
+ 
+PUBLISHED TRAPS
+^^^^^^^^^^^^^^^
+
+SNMPTRAP's first priority is to receive and decode SNMP traps, then
+publish the results to a configured DMAAP/MR message bus.  Traps that
+are successfully published (e.g. publish attempt gets a "200/ok"
+response from the DMAAP/MR server) are logged to a file named by
+the technology being used combined with the topic being published to.  
+
+If you find a trap in this published log, it has been acknowledged as
+received by DMAAP/MR.  If consumers complain of "missing traps", the
+source of the problem will be downstream (*not with SNMPTRAP*) if
+the trap has been logged here.
+
+For example, with a json config of:
+
+.. code-block:: json
+
+    "dmaap_info": {
+        "location": "mtl5",
+        "client_id": null,
+        "client_role": null,
+        "topic_url": "http://172.17.0.1:3904/events/ONAP-COLLECTOR-SNMPTRAP"
+
+and
+
+.. code-block:: json
+
+    "files": {
+        "**runtime_base_dir**": "/opt/app/snmptrap",
+
+result in traps that are confirmed (200/ok) as published logged to the file:
+
+.. code-block:: bash
+
+    /opt/app/snmptrap/logs/DMAAP_ONAP-COLLECTOR-SNMPTRAP.json
+
+An example from this JSON log is shown below:
+
+.. code-block:: json
+
+    {
+        "uuid": "0f40196a-78bb-11e8-bac7-005056865aac",
+        "agent address": "127.0.0.1",
+        "agent name": "server001",
+        "cambria.partition": "server001",
+        "community": "",
+        "community len": 0,
+        "epoch_serno": 15299605440000,
+        "protocol version": "v2c",
+        "time received": 1529960544.4896748,
+        "trap category": "DCAE-COLLECTOR-UCSNMP",
+        "sysUptime": "751564798",
+        "notify OID": "1.3.6.1.4.1.999.0.1",
+        "notify OID len": 9,
+        "varbinds": [
+            {
+                "varbind_oid": "1.3.6.1.4.1.999.0.1.1",
+                "varbind_type": "OctetString",
+                "varbind_value": "TEST TRAP"
+            }
+        ]
+    }
+
+
+
+EELF
+^^^^
+
+For program/operational logging, **SNMPTRAP** follows the EELF logging
+convention.  Please be aware that the EELF specification results in
+messages spread across various files.  Some work may be required to
+find the right location (file) that contains the message you are
+looking for.
+
+EELF logging is controlled by the configuration provided
+to **SNMPTRAP** by CBS, or via the fallback config file specified
+as an environment variable "CBS_SIM_JSON" at startup.  The section
+of that JSON configuration that influences EELF logging is:
+
+.. code-block:: json
+
+    "files": {
+        <other json data>
+        ...
+        "**eelf_base_dir**": "/opt/app/snmptrap/logs",
+        "eelf_error": "error.log",
+        "eelf_debug": "debug.log",
+        "eelf_audit": "audit.log",
+        "eelf_metrics": "metrics.log",
+        "roll_frequency": "hour",
+    },
+    <other json data>
+    ...
+
+
+The base directory for all EELF logs is specified with:
+
+        **eelf_base_dir**
+
+Remaining eelf_<file> references are appended to the eelf_base_dir value
+to specify a logfile location.  The result using the above example would
+create the files:
+
+.. code-block:: bash
+
+        /opt/app/snmptrap/logs/error.log
+        /opt/app/snmptrap/logs/debug.log
+        /opt/app/snmptrap/logs/audit.log
+        /opt/app/snmptrap/logs/metrics.log
+
+Again using the above example configuration, these files will be rolled
+to an archived/timestamped version hourly.  The actually archival (to a
+timestamped filename) occurs when the first trap is
+received **in a new hour** (or minute, or day - depending
+on "roll_frequency" value).
+
+Error / Warning Messages
+------------------------
+
+Program Diagnostics
+^^^^^^^^^^^^^^^^^^^
+
+Detailed application log messages can be found in "snmptrapd_diag" (JSON
+config reference).  These can be very verbose and roll quickly
+depending on trap arrival rates, number of varbinds encountered,
+minimum_severity_to_log setting in JSON config, etc.
+
+In the default config, this file can be found at:
+
+.. code-block:: bash
+
+    /opt/app/snmptrap/logs/snmptrapd_diag.log
+
+Messages will be in the general format of:
+
+.. code-block:: none
+
+    2018-04-25T17:28:10,305|<module>|snmptrapd||||INFO|100||arriving traps logged to: /opt/app/snmptrap/logs/snmptrapd_arriving_traps.log
+    2018-04-25T17:28:10,305|<module>|snmptrapd||||INFO|100||published traps logged to: /opt/app/snmptrap/logs/DMAAP_com.att.dcae.dmaap.IST3.DCAE-COLLECTOR-UCSNMP.json
+    2018-04-25T17:28:10,306|<module>|snmptrapd||||INFO|100||Runtime PID file: /opt/app/snmptrap/tmp/snmptrapd.py.pid
+    2018-04-25T17:28:48,019|snmp_engine_observer_cb|snmptrapd||||DETAILED|100||snmp trap arrived from 192.168.1.139, assigned uuid: 1cd77e98-48ae-11e8-98e5-005056865aac
+    2018-04-25T17:28:48,023|snmp_engine_observer_cb|snmptrapd||||DETAILED|100||dns cache expired or missing for 192.168.1.139 - refreshing
+    2018-04-25T17:28:48,027|snmp_engine_observer_cb|snmptrapd||||DETAILED|100||cache for server001 (192.168.1.139) updated - set to expire at 1524677388
+    2018-04-25T17:28:48,034|snmp_engine_observer_cb|snmptrapd||||DETAILED|100||snmp trap arrived from 192.168.1.139, assigned uuid: 0f40196a-78bb-11e8-bac7-005056
+    2018-04-25T17:28:48,036|notif_receiver_cb|snmptrapd||||DETAILED|100||processing varbinds for 0f40196a-78bb-11e8-bac7-005056
+    2018-04-25T17:28:48,040|notif_receiver_cb|snmptrapd||||DETAILED|100||adding 0f40196a-78bb-11e8-bac7-005056 to buffer
+    
+    2018-06-25T21:02:24,491|notif_receiver_cb|snmptrapd||||DETAILED|100||trap 0f40196a-78bb-11e8-bac7-005056865aac : {"uuid": "0f40196a-78bb-11e8-bac7-005056865aac", "agent address": "192.168.1.139", "agent name": "server001", "cambria.partition": "server001", "community": "", "community len": 0, "epoch_serno": 15299605440000, "protocol version": "v2c", "time received": 1529960544.4896748, "trap category": "com.att.dcae.dmaap.IST3.DCAE-COLLECTOR-UCSNMP", "sysUptime": "751564798", "notify OID": "1.3.6.1.4.1.999.0.1", "notify OID len": 9, "varbinds": [{"varbind_oid": "1.3.6.1.4.1.999.0.1.1", "varbind_type": "OctetString", "varbind_value": "TEST TRAP"}]}
+    2018-06-25T21:02:24,496|post_dmaap|snmptrapd||||DETAILED|100||post_data_enclosed: {"uuid": "0f40196a-78bb-11e8-bac7-005056865aac", "agent address": "192.168.1.139", "agent name": "server001", "cambria.partition": "server001", "community": "", "community len": 0, "epoch_serno": 15299605440000, "protocol version": "v2c", "time received": 1529960544.4896748, "trap category": "com.att.dcae.dmaap.IST3.DCAE-COLLECTOR-UCSNMP", "sysUptime": "751564798", "notify OID": "1.3.6.1.4.1.999.0.1", "notify OID len": 9, "varbinds": [{"varbind_oid": "1.3.6.1.4.1.999.0.1.1", "varbind_type": "OctetString", "varbind_value": "TEST TRAP"}]}
+     
+
+Platform Status
+^^^^^^^^^^^^^^^
+
+.. code-block:: json
+
+        "perm_status_file": "snmptrapd_status.log",