My alert's not working

Im totally new to LibreNMS

Kindly assist how to write an alert for port usage greater then 20%.

I have written like this but not getting any alert.
Max: 100
Delay: 60
Interval: 300

macros.port_in_usage_perc >= 20 AND ports.ifDescr = “ether3”

total B/W running current is 1.5G and for that particular interface we have kept package/ capping of 1800Mbps and port speed is 10G

So now when the usage crossed 500Mbps i need a alert. Kindly assist me.

My validate.php output.

Component Version
LibreNMS 22.7.0-23-gd248e6561
DB Schema 2022_07_19_081224_plugins_unique_index (244)
PHP 7.4.3
Python 3.8.10
MySQL 10.3.34-MariaDB-0ubuntu0.20.04.1
RRDTool 1.7.2
SNMP 5.8

====================================

[OK] Composer Version: 2.3.10
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database Schema is current
[OK] SQL Server meets minimum requirements
[OK] lower_case_table_names is enabled
[OK] MySQL engine is optimal
[OK]
[OK] Database schema correct
[OK] MySQl and PHP time match
[OK] rrd_dir is writable
[OK] rrdtool version ok

it should be ifAlias

macros.port_usage_perc >= 20 AND macros.port_up = 1 AND ports.ifAlias = “bla bla”

All values are in bits or bytes?

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