Process and docker stats availability via telemetry agent

Revision

Rev	Date	Author	Change Description
0.1	09/12/19	Pradnya Mohite	Initial version

Scope

-Enable sonic streaming telemetry agent to send Process and docker stats data

Enable sonic streaming telemetry agent to send Process and docker stats data

For 1st part, Daemon code will be added under sonic-buildimage/files/image_config. A Daemon will start when OS starts. At every 2 min interval it will do following:
Delete all entries for Process and Docker stats from state db
Update Process and Docker stats data to state-DB.
Update last update time for process and Docker stats.

Details of CLI and state-DB given below.

Part 2

Verify that from state-DB data is available via telemetry agent

CLI output and corresponding structure in state-DB for process and docker stats

Process stats

$ ps -eo uid,pid,ppid,%mem,%cpu,stime,tty,time,cmd

 UID   PID  PPID %MEM %CPU STIME TT           TIME CMD
    0     1     0  0.1  0.0 Oct15 ?        00:00:09 /sbin/init
    0     2     0  0.0  0.0 Oct15 ?        00:00:00 [kthreadd]
    0     3     2  0.0  0.0 Oct15 ?        00:00:01 [ksoftirqd/0]
    0     5     2  0.0  0.0 Oct15 ?        00:00:00 [kworker/0:0H]

above output will be stored inside state-DB as follows for largest 1024 CPU consumption processes:

PROCESS_STATS|4276  
"UID"  
"0"  
"PID"  
"1"  
"PPID"  
"0"  
"CPU%"  
"0.0"  
"MEM%"  
"0.1"  
"TTY"  
"?"  
"STIME"  
"Oct15"  
"TIME"  
"00:00:09"  
"CMD"  
"/sbin/init"

Along with data new entry for timestamp will be updated in state_db:

PROCESS_STATS|LastUpdateTime

Docker stats

$ docker stats --no-stream -a

CONTAINER ID        NAME                CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O           PIDS
209c6e6116c6        syncd               10.82%              286MiB / 3.844GiB     7.26%               0B / 0B             0B / 639kB          32
8a97fafdbd60        dhcp_relay          0.02%               12.15MiB / 3.844GiB   0.31%               0B / 0B             0B / 65.5kB         5

above output will be stored inside state-DB as follows:

DOCKER_STATS|209c6e6116c6     
"NAME"  
"syncd"  
"CPU%"  
"10.82"  
"MEM_BYTES"  
"299892736"  
"MEM_LIMIT_BYTES"  
"4127463571"  
"MEM%"  
"7.26"  
"NET_IN_BYTES"  
"0"  
"NET_OUT_BYTES"  
"0"  
"BLOCK_IN_BYTES"  
"0"  
"BLOCK_OUT_BYTES"  
"639000"  
"PIDS"  
"32"