DHCP Stats fail to populate graphs

My installation:
====================================
Component | Version
--------- | -------
LibreNMS | 21.1.0-32-g28d69c5
DB Schema | 2021_02_08_224355_fix_invalid_dates (199)
PHP | 7.4.12
Python | 3.6.8
MySQL | 5.5.65-MariaDB
RRDTool | 1.4.8
SNMP | NET-SNMP 5.7.2
====================================

[OK]    Composer Version: 2.0.9
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[OK]    Database schema correct

I’m tring to add DHCP stats to monitor my DHCP servers (based on CentOS 7), using this guide: Applications - LibreNMS Docs

SNMP call work properly so, I suppose the SNMP Extend Agents was successfull implemented

snmpwalk -Oqv -v2c -c [omitted] .1.3.6.1.4.1.8072.1.3.2.4.1.2.9.100.104.99.112.115.116.97.116

{\"version\": 2, \"data\": {\"pools\": [{\"max\": \"20\", \"last_ip\": \"10.1.101.194\", \"percent\": \"0.000\", \"cur\": \"0\", \"first_ip\": \"10.1.101.175\"}, {\"max\": \"20\", \"last_ip\": \"10.1.102.194\", \"percent\": \"0.000\", \"cur\": \"0\", \"first_ip\": \"10.1.102.175\"}, .....

I see this kind of output also from Capture-Poller or Capture-SNMP.

But I don’t have Graphs populated correctly:

Where I can check if data from SNMP Query is correctly load on LibreNMS DB? and how I can view what data is passed to RRD engine?

Thanks

Adding some info from Poller:

`LibreNMS Poller

SQL[select migration from migrations order by id desc limit 1 [] 0.43ms]

SQL[select count(*) as aggregate from migrations limit 1 [] 0.49ms]

SQL[SELECT version() [] 0.28ms]

===================================
Version info:
Commit SHA: 28d69c52309eb02d176f263c7ce39ab89b566dde
Commit Date: 1613361032
DB Schema: 2021_02_08_224355_fix_invalid_dates (199)
PHP: 7.4.12
MySQL: 5.5.65-MariaDB
RRDTool: 1.4.8
SNMP: NET-SNMP 5.7.2
==================================DEBUG!
Updating os_def.cache
Override poller modules: applications
Starting polling run:`

Load poller module applications

SQL[SELECT * FROM applications WHERE device_id = ? [67] 0.44ms]
SNMP[’/usr/bin/snmpget’ ‘-v2c’ ‘-c’ ‘COMMUNITY’ ‘-Oqv’ ‘-m’ ‘NET-SNMP-EXTEND-MIB’ ‘-M’ ‘/opt/librenms/mibs’ ‘udp:HOSTNAME:161’ ‘nsExtendOutputFull.9.100.104.99.112.115.116.97.116.115’]
{“version”: 2, “data”: {“pools”: [{“max”: “20”, “last_ip”: “", “percent”: “0.000”, “cur”: “0”, “first_ip”: "”}, …
SNMP[’/usr/bin/snmpbulkwalk’ ‘-v2c’ ‘-c’ ‘COMMUNITY’ ‘-Oqv’ ‘-m’ ‘NET-SNMP-EXTEND-MIB’ ‘-M’ ‘/opt/librenms/mibs’ ‘udp:HOSTNAME:161’ ‘.1.3.6.1.4.1.8072.1.3.2.4.1.2.9.100.104.99.112.115.116.97.116.115’]
{“version”: 2, “data”: {“pools”: [{“max”: “20”, “last_ip”: “", “percent”: “0.000”, “cur”: “0”, “first_ip”: "”},
SQL[SELECT * FROM application_metrics WHERE app_id=? [13] 0.78ms]
: …

What about application_metrics empty?

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