tree 767059a551f479f163b28616029b5d417f5fe316
parent 84efff0c639ed24e3b47394e8c38d3aba75b1a41
author Josh Lehan <krellan@google.com> 1603947546 -0700
committer Vernon Mauery <vernon.mauery@linux.intel.com> 1615390880 +0000

sensorcommands: Add IPMI reading logging instrumentation

Noteworthy sensor readings, such as the first reading,
a new minimum or maximum value, or ending a good or
bad streak of readings, will now have some useful logging output.

Tested: Example logs
```
root@bmc:~# journalctl --no-pager | grep 'IPMI sensor'
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor0: First reading, value=6 byte=51
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor0: Range min=0 max=30, Coefficients mValue=118 rExp=-3 bValue=0 bExp=0 bSigned=0
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor1: First reading, value=7 byte=59
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor1: Range min=0 max=30, Coefficients mValue=118 rExp=-3 bValue=0 bExp=0 bSigned=0
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor2: First reading, value=1.437 byte=12
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor2: Range min=0 max=30, Coefficients mValue=118 rExp=-3 bValue=0 bExp=0 bSigned=0
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor3: First reading, value=1.437 byte=12
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor3: Range min=0 max=30, Coefficients mValue=118 rExp=-3 bValue=0 bExp=0 bSigned=0
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor4: First reading, value=1.96 byte=17
Jan 01 00:03:16 bmc ipmid[2865]: IPMI sensor sensor4: Range min=0 max=30, Coefficients mValue=118 rExp=-3 bValue=0 bExp=0 bSigned=0
...
```
Machine and sensors names are replaced.

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: Idf7c8d4285b286fdc0afb3f0e7260c2d4915b326
Signed-off-by: Willy Tu <wltu@google.com>