[Auto Techsupport] Added Event Driven TS to Command Reference (sonic-net#1985)

Added the Event Driven Tech Support related information to the Command Reference Guide. HLD

Author: vivekrnv

doc/Command-Reference.md

@@ -172,6 +172,7 @@
   * [SONiC Installer](#sonic-installer)
 * [Troubleshooting Commands](#troubleshooting-commands)
   * [Debug Dumps](#debug-dumps)
+  * [Event Driven Techsupport Invocation](#event-driven-techsupport-invocation)
 * [Routing Stack](#routing-stack)
 * [Quagga BGP Show Commands](#Quagga-BGP-Show-Commands)
 * [ZTP Configuration And Show Commands](#ztp-configuration-and-show-commands)
@@ -10084,8 +10085,178 @@ In SONiC, there usually exists a set of tables related/relevant to a particular
 	    }
 	}	
   ```
-  
+
+### Event Driven Techsupport Invocation
+
+This feature/capability makes the techsupport invocation event-driven based on core dump generation. This feature is only applicable for the processes running in the containers. More detailed explanation can be found in the HLD https://github.com/Azure/SONiC/blob/master/doc/auto_techsupport_and_coredump_mgmt.md
+
+#### config auto-techsupport global commands
+		
+**config auto-techsupport global state**
+
+- Usage:
+  ```
+  config auto-techsupport global state <enabled/disabled>
+  ```
+
+- Example:
+  ```
+  config auto-techsupport global state enabled
+  ```
+
+**config auto-techsupport global rate-limit-interval <uint16>**
+
+- Usage:
+  ```
+  config auto-techsupport global rate-limit-interval <uint16>
+  ```
+  - Parameters:
+    - rate-limit-interval: Minimum time in seconds to wait after the last techsupport creation time before invoking a new one. 
+
+- Example:
+  ```
+  config auto-techsupport global rate-limit-interval 200
+  ```
+
+**config auto-techsupport global max-techsupport-limit <float upto two decimal places>**
+
+- Usage:
+  ```
+  config auto-techsupport global max-techsupport-limit <float upto two decimal places>
+  ```
+  - Parameters:
+    - max-techsupport-limit: A percentage value should be specified. This signifies maximum size to which /var/dump/ directory can be grown until. 
+
+- Example:
+  ```
+  config auto-techsupport global max-techsupport-limit 10.15
+  ```
+
+**config auto-techsupport global max-core-limit <float upto two decimal places>**
+
+- Usage:
+  ```
+  config auto-techsupport global max-core-limit <float upto two decimal places>
+  ```
+  - Parameters:
+    - max-core-limit: A percentage value should be specified. This signifies maximum size to which /var/core/ directory can be grown until. 
+
+- Example:
+  ```
+  config auto-techsupport global max-core-limit 10.15
+  ```
+
+**config auto-techsupport global since**
+
+- Usage:
+  ```
+  config auto-techsupport global since <string>
+  ```
+  - Parameters:
+    - since: This limits the auto-invoked techsupport to only collect the logs & core-dumps generated since the time provided.  Any valid date string of the formats specified here can be used. (https://www.gnu.org/software/coreutils/manual/html_node/Date-input-formats.html). If this value is not explicitly configured or a non-valid string is provided, a default value of "2 days ago" is used. 
+
+- Example:
+  ```
+  config auto-techsupport global since <string>
+  ```
+
+
+#### config auto-techsupport-feature commands
+
+**config auto-techsupport-feature add**
 		
+- Usage:
+  ```
+  config auto-techsupport-feature add <feature_name> --state <enabled/disabled> --rate-limit-interval <uint16>
+  ```
+  - Parameters:
+    - state: enable/disable the capability for the specific feature/container.
+    - rate-limit-interval: Rate limit interval for the corresponding feature. Configure 0 to explicitly disable. For the techsupport to be generated by auto-techsupport, both the global and feature specific rate-limit-interval has to be passed
+
+- Example:
+  ```
+  config auto-techsupport-feature add bgp --state enabled --rate-limit-interval 200
+  ```
+
+
+**config auto-techsupport-feature delete**
+		
+- Usage:
+  ```
+  config auto-techsupport-feature delete <feature_name>
+  ```
+
+- Example:
+  ```
+  config auto-techsupport-feature delete swss
+  ```
+
+**config auto-techsupport-feature update**
+		
+- Usage:
+  ```
+  config auto-techsupport-feature update <feature_name> --state <enabled/disabled>
+  config auto-techsupport-feature update <feature_name> --rate-limit-interval <uint16>
+  ```
+
+- Example:
+  ```
+  config auto-techsupport-feature update snmp --state enabled
+  config auto-techsupport-feature update swss --rate-limit-interval 200
+  ```
+
+#### Show CLI:
+ 
+**show auto-techsupport global**
+		
+- Usage:
+  ```
+  show auto-techsupport global
+  ```
+
+- Example:
+  ```
+  admin@sonic:~$ show auto-techsupport global
+  STATE      RATE LIMIT INTERVAL (sec)    MAX TECHSUPPORT LIMIT (%)    MAX CORE LIMIT (%)       SINCE
+  -------  ---------------------------   --------------------------    ------------------  ----------
+  enabled                          180                        10.0                   5.0   2 days ago
+  ```
+
+**show auto-techsupport-feature**
+		
+- Usage:
+  ```
+  show auto-techsupport-feature 
+  ```
+
+- Example:
+  ```
+  admin@sonic:~$ show auto-techsupport-feature 
+  FEATURE NAME    STATE       RATE LIMIT INTERVAL (sec) 
+  --------------  --------  --------------------------
+  bgp             enabled                          600
+  database        enabled                          600
+  dhcp_relay      enabled                          600
+  lldp            enabled                          600
+  swss            disabled                         800
+  ```
+
+**show auto-techsupport history** 
+		
+- Usage:
+  ```
+  show auto-techsupport history 
+  ```
+
+- Example:
+  ```
+  admin@sonic:~$ show auto-techsupport history
+  TECHSUPPORT DUMP                          TRIGGERED BY    CORE DUMP
+  ----------------------------------------  --------------  -----------------------------
+  sonic_dump_r-lionfish-16_20210901_221402  bgp             bgpcfgd.1630534439.55.core.gz
+  sonic_dump_r-lionfish-16_20210901_203725  snmp            python3.1630528642.23.core.gz
+  sonic_dump_r-lionfish-16_20210901_222408  teamd           python3.1630535045.34.core.gz
+  ```
 		
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