
# TrueNAS CORE by SNMP

## Overview

Template for monitoring TrueNAS CORE by SNMP.

## Requirements

Zabbix version: 7.0 and higher.

## Tested versions

This template has been tested on:
- TrueNAS CORE 12.0-U8
- TrueNAS CORE 13.0-U5.3

## Configuration

> Zabbix should be configured according to the instructions in the [Templates out of the box](https://www.zabbix.com/documentation/7.0/manual/config/templates_out_of_the_box) section.

## Setup

1. Import the template into Zabbix.
2. Enable SNMP daemon at Services in TrueNAS CORE web interface: https://www.truenas.com/docs/core/uireference/services/snmpscreen/
3. Link the template to the host.

### Macros used

|Name|Description|Default|
|----|-----------|-------|
|{$CPU.UTIL.CRIT}|<p>Threshold of CPU utilization for warning trigger in %.</p>|`90`|
|{$ICMP_LOSS_WARN}|<p>Threshold of ICMP packets loss for warning trigger in %.</p>|`20`|
|{$ICMP_RESPONSE_TIME_WARN}|<p>Threshold of average ICMP response time for warning trigger in seconds.</p>|`0.15`|
|{$IF.ERRORS.WARN}|<p>Threshold of error packets rate for warning trigger. Can be used with interface name as context.</p>|`2`|
|{$IF.UTIL.MAX}|<p>Threshold of interface bandwidth utilization for warning trigger in %. Can be used with interface name as context.</p>|`90`|
|{$IFCONTROL}|<p>Macro for operational state of the interface for link down trigger. Can be used with interface name as context.</p>|`1`|
|{$LOAD_AVG_PER_CPU.MAX.WARN}|<p>Load per CPU considered sustainable. Tune if needed.</p>|`1.5`|
|{$MEMORY.AVAILABLE.MIN}|<p>Threshold of available memory for trigger in bytes.</p>|`20M`|
|{$MEMORY.UTIL.MAX}|<p>Threshold of memory utilization for trigger in %</p>|`90`|
|{$NET.IF.IFADMINSTATUS.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`^.*`|
|{$NET.IF.IFADMINSTATUS.NOT_MATCHES}|<p>Ignore down(2) administrative status</p>|`^2$`|
|{$NET.IF.IFALIAS.MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`.*`|
|{$NET.IF.IFALIAS.NOT_MATCHES}|<p>This macro is used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$NET.IF.IFDESCR.MATCHES}|<p>This macro used in filters of network interfaces discovery rule.</p>|`.*`|
|{$NET.IF.IFDESCR.NOT_MATCHES}|<p>This macro used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$NET.IF.IFNAME.NOT_MATCHES}|<p>This macro used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$NET.IF.IFOPERSTATUS.MATCHES}|<p>This macro used in filters of network interfaces discovery rule.</p>|`^.*$`|
|{$NET.IF.IFOPERSTATUS.NOT_MATCHES}|<p>Ignore notPresent(6)</p>|`^6$`|
|{$NET.IF.IFTYPE.MATCHES}|<p>This macro used in filters of network interfaces discovery rule.</p>|`.*`|
|{$NET.IF.IFTYPE.NOT_MATCHES}|<p>This macro used in filters of network interfaces discovery rule.</p>|`CHANGE_IF_NEEDED`|
|{$SNMP.TIMEOUT}|<p>The time interval for SNMP availability trigger.</p>|`5m`|
|{$SWAP.PFREE.MIN.WARN}|<p>Threshold of free swap space for warning trigger in %.</p>|`50`|
|{$VFS.DEV.DEVNAME.MATCHES}|<p>This macro is used in block devices discovery. Can be overridden on the host or linked template level</p>|`.+`|
|{$VFS.DEV.DEVNAME.NOT_MATCHES}|<p>This macro is used in block devices discovery. Can be overridden on the host or linked template level</p>|`Macro too long. Please see the template.`|
|{$DATASET.NAME.MATCHES}|<p>This macro is used in datasets discovery. Can be overridden on the host or linked template level</p>|`.+`|
|{$DATASET.NAME.NOT_MATCHES}|<p>This macro is used in datasets discovery. Can be overridden on the host or linked template level</p>|`^(boot\|.+\.system(.+)?$)`|
|{$ZPOOL.PUSED.MAX.WARN}|<p>Threshold of used pool space for warning trigger in %.</p>|`80`|
|{$ZPOOL.FREE.MIN.WARN}|<p>This macro is used for trigger expression. It can be overridden on the host or linked on the template level.</p>|`5G`|
|{$ZPOOL.PUSED.MAX.CRIT}|<p>Threshold of used pool space for average severity trigger in %.</p>|`90`|
|{$ZPOOL.FREE.MIN.CRIT}|<p>This macro is used for trigger expression. It can be overridden on the host or linked on the template level.</p>|`5G`|
|{$DATASET.PUSED.MAX.WARN}|<p>Threshold of used dataset space for warning trigger in %.</p>|`80`|
|{$DATASET.FREE.MIN.WARN}|<p>This macro is used for trigger expression. It can be overridden on the host or linked on the template level.</p>|`5G`|
|{$DATASET.PUSED.MAX.CRIT}|<p>Threshold of used dataset space for average severity trigger in %.</p>|`90`|
|{$DATASET.FREE.MIN.CRIT}|<p>This macro is used for trigger expression. It can be overridden on the host or linked on the template level.</p>|`5G`|
|{$TEMPERATURE.MAX.WARN}|<p>This macro is used for trigger expression. It can be overridden on the host or linked on the template level.</p>|`50`|
|{$TEMPERATURE.MAX.CRIT}|<p>This macro is used for trigger expression. It can be overridden on the host or linked on the template level.</p>|`65`|

### Items

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|ICMP ping|<p>Host accessibility by ICMP.</p><p>0 - ICMP ping fails.</p><p>1 - ICMP ping successful.</p>|Simple check|icmpping|
|ICMP loss|<p>Percentage of lost packets.</p>|Simple check|icmppingloss|
|ICMP response time|<p>ICMP ping response time (in seconds).</p>|Simple check|icmppingsec|
|System contact details|<p>MIB: SNMPv2-MIB</p><p>The textual identification of the contact person for this managed node, together with information on how to contact this person. If no contact information is known, the value is the zero-length string.</p>|SNMP agent|system.contact<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|System description|<p>MIB: SNMPv2-MIB</p><p>System description of the host.</p>|SNMP agent|system.descr<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|System location|<p>MIB: SNMPv2-MIB</p><p>The physical location of this node. If the location is unknown, the value is the zero-length string.</p>|SNMP agent|system.location<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|System name|<p>MIB: SNMPv2-MIB</p><p>The host name of the system.</p>|SNMP agent|system.name<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|System object ID|<p>MIB: SNMPv2-MIB</p><p>The vendor authoritative identification of the network management subsystem contained in the entity. This value is allocated within the SMI enterprises subtree (1.3.6.1.4.1) and provides an easy and unambiguous means for determining what kind of box is being managed.</p>|SNMP agent|system.objectid<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|Uptime|<p>MIB: HOST-RESOURCES-MIB</p><p>The amount of time since this host was last initialized. Note that this is different from sysUpTime in the SNMPv2-MIB [RFC1907] because sysUpTime is the uptime of the network management portion of the system.</p>|SNMP agent|system.uptime<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `0.01`</p></li></ul>|
|SNMP traps (fallback)|<p>The item is used to collect all SNMP traps unmatched by other snmptrap items.</p>|SNMP trap|snmptrap.fallback|
|SNMP agent availability|<p>Availability of SNMP checks on the host. The value of this item corresponds to availability icons in the host list.</p><p>Possible values:</p><p>0 - not available</p><p>1 - available</p><p>2 - unknown</p>|Zabbix internal|zabbix[host,snmp,available]|
|Interrupts per second|<p>MIB: UCD-SNMP-MIB</p><p>Number of interrupts processed.</p>|SNMP agent|system.cpu.intr<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|Context switches per second|<p>MIB: UCD-SNMP-MIB</p><p>Number of context switches.</p>|SNMP agent|system.cpu.switches<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|Load average (1m avg)|<p>MIB: UCD-SNMP-MIB</p><p>The 1 minute load averages.</p>|SNMP agent|system.cpu.load.avg1|
|Load average (5m avg)|<p>MIB: UCD-SNMP-MIB</p><p>The 5 minutes load averages.</p>|SNMP agent|system.cpu.load.avg5|
|Load average (15m avg)|<p>MIB: UCD-SNMP-MIB</p><p>The 15 minutes load averages.</p>|SNMP agent|system.cpu.load.avg15|
|Number of CPUs|<p>MIB: HOST-RESOURCES-MIB</p><p>Count the number of CPU cores by counting number of cores discovered in hrProcessorTable using LLD.</p>|SNMP agent|system.cpu.num<p>**Preprocessing**</p><ul><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|
|Free memory|<p>MIB: UCD-SNMP-MIB</p><p>The amount of real/physical memory currently unused or available.</p>|SNMP agent|vm.memory.free<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|Memory (buffers)|<p>MIB: UCD-SNMP-MIB</p><p>The total amount of real or virtual memory currently allocated for use as memory buffers.</p>|SNMP agent|vm.memory.buffers<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|Memory (cached)|<p>MIB: UCD-SNMP-MIB</p><p>The total amount of real or virtual memory currently allocated for use as cached memory.</p>|SNMP agent|vm.memory.cached<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|Total memory|<p>MIB: UCD-SNMP-MIB</p><p>The total memory expressed in bytes.</p>|SNMP agent|vm.memory.total<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|Available memory|<p>Please note that memory utilization is a rough estimate, since memory available is calculated as free+buffers+cached, which is not 100% accurate, but the best we can get using SNMP.</p>|Calculated|vm.memory.available|
|Memory utilization|<p>Please note that memory utilization is a rough estimate, since memory available is calculated as free+buffers+cached, which is not 100% accurate, but the best we can get using SNMP.</p>|Calculated|vm.memory.util|
|Total swap space|<p>MIB: UCD-SNMP-MIB</p><p>The total amount of swap space configured for this host.</p>|SNMP agent|system.swap.total<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|Free swap space|<p>MIB: UCD-SNMP-MIB</p><p>The amount of swap space currently unused or available.</p>|SNMP agent|system.swap.free<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|Free swap space in %|<p>The free space of the swap volume/file expressed in %.</p>|Calculated|system.swap.pfree<p>**Preprocessing**</p><ul><li><p>Check for not supported value: `any error`</p><p>⛔️Custom on fail: Set value to: `100`</p></li></ul>|
|ARC size|<p>MIB: FREENAS-MIB</p><p>ARC size in bytes.</p>|SNMP agent|truenas.zfs.arc.size<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|ARC metadata size|<p>MIB: FREENAS-MIB</p><p>ARC metadata size used in bytes.</p>|SNMP agent|truenas.zfs.arc.meta<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|ARC data size|<p>MIB: FREENAS-MIB</p><p>ARC data size used in bytes.</p>|SNMP agent|truenas.zfs.arc.data<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li></ul>|
|ARC hits|<p>MIB: FREENAS-MIB</p><p>Total amount of cache hits in the ARC per second.</p>|SNMP agent|truenas.zfs.arc.hits<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|ARC misses|<p>MIB: FREENAS-MIB</p><p>Total amount of cache misses in the ARC per second.</p>|SNMP agent|truenas.zfs.arc.misses<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|ARC target size of cache|<p>MIB: FREENAS-MIB</p><p>ARC target size of cache in bytes.</p>|SNMP agent|truenas.zfs.arc.c<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|ARC target size of MRU|<p>MIB: FREENAS-MIB</p><p>ARC target size of MRU in bytes.</p>|SNMP agent|truenas.zfs.arc.p<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|ARC cache hit ratio|<p>MIB: FREENAS-MIB</p><p>ARC cache hit ration percentage.</p>|SNMP agent|truenas.zfs.arc.hit.ratio|
|ARC cache miss ratio|<p>MIB: FREENAS-MIB</p><p>ARC cache miss ration percentage.</p>|SNMP agent|truenas.zfs.arc.miss.ratio|
|L2ARC hits|<p>MIB: FREENAS-MIB</p><p>Hits to the L2 cache per second.</p>|SNMP agent|truenas.zfs.l2arc.hits<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|L2ARC misses|<p>MIB: FREENAS-MIB</p><p>Misses to the L2 cache per second.</p>|SNMP agent|truenas.zfs.l2arc.misses<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|L2ARC read rate|<p>MIB: FREENAS-MIB</p><p>Read rate from L2 cache in bytes per second.</p>|SNMP agent|truenas.zfs.l2arc.read<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|L2ARC write rate|<p>MIB: FREENAS-MIB</p><p>Write rate from L2 cache in bytes per second.</p>|SNMP agent|truenas.zfs.l2arc.write<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|L2ARC size|<p>MIB: FREENAS-MIB</p><p>L2ARC size in bytes.</p>|SNMP agent|truenas.zfs.l2arc.size<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1024`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|ZIL operations 1 second|<p>MIB: FREENAS-MIB</p><p>The ops column parsed from the command zilstat 1 1.</p>|SNMP agent|truenas.zfs.zil.ops1|
|ZIL operations 5 seconds|<p>MIB: FREENAS-MIB</p><p>The ops column parsed from the command zilstat 5 1.</p>|SNMP agent|truenas.zfs.zil.ops5|
|ZIL operations 10 seconds|<p>MIB: FREENAS-MIB</p><p>The ops column parsed from the command zilstat 10 1.</p>|SNMP agent|truenas.zfs.zil.ops10|

### Triggers

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|Unavailable by ICMP ping|<p>Last three attempts returned timeout.  Please check device connectivity.</p>|`max(/TrueNAS CORE by SNMP/icmpping,#3)=0`|High||
|High ICMP ping loss|<p>ICMP packets loss detected.</p>|`min(/TrueNAS CORE by SNMP/icmppingloss,5m)>{$ICMP_LOSS_WARN} and min(/TrueNAS CORE by SNMP/icmppingloss,5m)<100`|Warning|**Depends on**:<br><ul><li>Unavailable by ICMP ping</li></ul>|
|High ICMP ping response time|<p>Average ICMP response time is too big.</p>|`avg(/TrueNAS CORE by SNMP/icmppingsec,5m)>{$ICMP_RESPONSE_TIME_WARN}`|Warning|**Depends on**:<br><ul><li>Unavailable by ICMP ping</li></ul>|
|System name has changed|<p>The name of the system has changed. Acknowledge to close the problem manually.</p>|`last(/TrueNAS CORE by SNMP/system.name,#1)<>last(/TrueNAS CORE by SNMP/system.name,#2) and length(last(/TrueNAS CORE by SNMP/system.name))>0`|Info|**Manual close**: Yes|
|Host has been restarted|<p>Uptime is less than 10 minutes.</p>|`last(/TrueNAS CORE by SNMP/system.uptime)<10m`|Info|**Manual close**: Yes|
|No SNMP data collection|<p>SNMP is not available for polling. Please check device connectivity and SNMP settings.</p>|`max(/TrueNAS CORE by SNMP/zabbix[host,snmp,available],{$SNMP.TIMEOUT})=0`|Warning|**Depends on**:<br><ul><li>Unavailable by ICMP ping</li></ul>|
|Load average is too high|<p>The load average per CPU is too high. The system may be slow to respond.</p>|`min(/TrueNAS CORE by SNMP/system.cpu.load.avg1,5m)/last(/TrueNAS CORE by SNMP/system.cpu.num)>{$LOAD_AVG_PER_CPU.MAX.WARN} and last(/TrueNAS CORE by SNMP/system.cpu.load.avg5)>0 and last(/TrueNAS CORE by SNMP/system.cpu.load.avg15)>0`|Average||
|Lack of available memory|<p>The system is running out of memory.</p>|`min(/TrueNAS CORE by SNMP/vm.memory.available,5m)<{$MEMORY.AVAILABLE.MIN} and last(/TrueNAS CORE by SNMP/vm.memory.total)>0`|Average||
|High memory utilization|<p>The system is running out of free memory.</p>|`min(/TrueNAS CORE by SNMP/vm.memory.util,5m)>{$MEMORY.UTIL.MAX}`|Average|**Depends on**:<br><ul><li>Lack of available memory</li></ul>|
|High swap space usage|<p>If there is no swap configured, this trigger is ignored.</p>|`min(/TrueNAS CORE by SNMP/system.swap.pfree,5m)<{$SWAP.PFREE.MIN.WARN} and last(/TrueNAS CORE by SNMP/system.swap.total)>0`|Warning|**Depends on**:<br><ul><li>Lack of available memory</li><li>High memory utilization</li></ul>|

### LLD rule CPU discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|CPU discovery|<p>This discovery will create set of per core CPU metrics from UCD-SNMP-MIB, using {#CPU.COUNT} in preprocessing. That's the only reason why LLD is used.</p>|Dependent item|cpu.discovery<p>**Preprocessing**</p><ul><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|

### Item prototypes for CPU discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|CPU idle time|<p>MIB: UCD-SNMP-MIB</p><p>The time the CPU has spent doing nothing.</p>|SNMP agent|system.cpu.idle[{#SNMPINDEX}]|
|CPU system time|<p>MIB: UCD-SNMP-MIB</p><p>The time the CPU has spent running the kernel and its processes.</p>|SNMP agent|system.cpu.system[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|
|CPU user time|<p>MIB: UCD-SNMP-MIB</p><p>The time the CPU has spent running users' processes that are not niced.</p>|SNMP agent|system.cpu.user[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|
|CPU nice time|<p>MIB: UCD-SNMP-MIB</p><p>The time the CPU has spent running users' processes that have been niced.</p>|SNMP agent|system.cpu.nice[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|
|CPU iowait time|<p>MIB: UCD-SNMP-MIB</p><p>The amount of time the CPU has been waiting for I/O to complete.</p>|SNMP agent|system.cpu.iowait[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|
|CPU interrupt time|<p>MIB: UCD-SNMP-MIB</p><p>The amount of time the CPU has been servicing hardware interrupts.</p>|SNMP agent|system.cpu.interrupt[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>JavaScript: `The text is too long. Please see the template.`</p></li></ul>|
|CPU utilization|<p>The CPU utilization expressed in %.</p>|Dependent item|system.cpu.util[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>JavaScript: `//Calculate utilization<br>return (100 - value)`</p></li></ul>|

### Trigger prototypes for CPU discovery

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|High CPU utilization|<p>The CPU utilization is too high. The system might be slow to respond.</p>|`min(/TrueNAS CORE by SNMP/system.cpu.util[{#SNMPINDEX}],5m)>{$CPU.UTIL.CRIT}`|Warning|**Depends on**:<br><ul><li>Load average is too high</li></ul>|

### LLD rule Block devices discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|Block devices discovery|<p>Block devices are discovered from UCD-DISKIO-MIB::diskIOTable (http://net-snmp.sourceforge.net/docs/mibs/ucdDiskIOMIB.html#diskIOTable).</p>|SNMP agent|vfs.dev.discovery|

### Item prototypes for Block devices discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|TrueNAS CORE: [{#DEVNAME}]: Disk read rate|<p>MIB: UCD-DISKIO-MIB</p><p>The number of read accesses from this device since boot.</p>|SNMP agent|vfs.dev.read.rate[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: [{#DEVNAME}]: Disk write rate|<p>MIB: UCD-DISKIO-MIB</p><p>The number of write accesses from this device since boot.</p>|SNMP agent|vfs.dev.write.rate[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: [{#DEVNAME}]: Disk utilization|<p>MIB: UCD-DISKIO-MIB</p><p>The 1 minute average load of disk (%).</p>|SNMP agent|vfs.dev.util[{#SNMPINDEX}]|

### LLD rule Network interfaces discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|Network interfaces discovery|<p>Discovering interfaces from IF-MIB.</p>|SNMP agent|net.if.discovery|

### Item prototypes for Network interfaces discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Inbound packets discarded|<p>MIB: IF-MIB</p><p>The number of inbound packets which were chosen to be discarded</p><p>even though no errors had been detected to prevent their being deliverable to a higher-layer protocol.</p><p>One possible reason for discarding such a packet could be to free up buffer space.</p><p>Discontinuities in the value of this counter can occur at re-initialization of the management system,</p><p>and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.in.discards[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Inbound packets with errors|<p>MIB: IF-MIB</p><p>For packet-oriented interfaces, the number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.  For character-oriented or fixed-length interfaces, the number of inbound transmission units that contained errors preventing them from being deliverable to a higher-layer protocol. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.in.errors[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Bits received|<p>MIB: IF-MIB</p><p>The total number of octets received on the interface, including framing characters. This object is a 64-bit version of ifInOctets. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.in[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Outbound packets discarded|<p>MIB: IF-MIB</p><p>The number of outbound packets which were chosen to be discarded</p><p>even though no errors had been detected to prevent their being deliverable to a higher-layer protocol.</p><p>One possible reason for discarding such a packet could be to free up buffer space.</p><p>Discontinuities in the value of this counter can occur at re-initialization of the management system,</p><p>and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.out.discards[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Outbound packets with errors|<p>MIB: IF-MIB</p><p>For packet-oriented interfaces, the number of outbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.  For character-oriented or fixed-length interfaces, the number of outbound transmission units that contained errors preventing them from being deliverable to a higher-layer protocol. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.out.errors[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Bits sent|<p>MIB: IF-MIB</p><p>The total number of octets transmitted out of the interface, including framing characters. This object is a 64-bit version of ifOutOctets.Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime.</p>|SNMP agent|net.if.out[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li>Change per second</li><li><p>Custom multiplier: `8`</p></li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Speed|<p>MIB: IF-MIB</p><p>An estimate of the interface's current bandwidth in units of 1,000,000 bits per second. If this object reports a value of `n' then the speed of the interface is somewhere in the range of `n-500,000' to`n+499,999'.  For interfaces which do not vary in bandwidth or for those where no accurate estimation can be made, this object should contain the nominal bandwidth. For a sub-layer which has no concept of bandwidth, this object should be zero.</p>|SNMP agent|net.if.speed[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `1000000`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Operational status|<p>MIB: IF-MIB</p><p>The current operational state of the interface.</p><p>- The testing(3) state indicates that no operational packet scan be passed</p><p>- If ifAdminStatus is down(2) then ifOperStatus should be down(2)</p><p>- If ifAdminStatus is changed to up(1) then ifOperStatus should change to up(1) if the interface is ready to transmit and receive network traffic</p><p>- It should change todormant(5) if the interface is waiting for external actions (such as a serial line waiting for an incoming connection)</p><p>- It should remain in the down(2) state if and only if there is a fault that prevents it from going to the up(1) state</p><p>- It should remain in the notPresent(6) state if the interface has missing(typically, hardware) components.</p>|SNMP agent|net.if.status[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Interface type|<p>MIB: IF-MIB</p><p>The type of interface.</p><p>Additional values for ifType are assigned by the Internet Assigned Numbers Authority (IANA),</p><p>through updating the syntax of the IANAifType textual convention.</p>|SNMP agent|net.if.type[{#SNMPINDEX}]<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|

### Trigger prototypes for Network interfaces discovery

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: High input error rate|<p>It recovers when it is below 80% of the `{$IF.ERRORS.WARN:"{#IFNAME}"}` threshold.</p>|`min(/TrueNAS CORE by SNMP/net.if.in.errors[{#SNMPINDEX}],5m)>{$IF.ERRORS.WARN:"{#IFNAME}"}`|Warning|**Depends on**:<br><ul><li>TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: High inbound bandwidth usage|<p>The utilization of the network interface is close to its estimated maximum bandwidth.</p>|`(avg(/TrueNAS CORE by SNMP/net.if.in[{#SNMPINDEX}],15m)>({$IF.UTIL.MAX:"{#IFNAME}"}/100)*last(/TrueNAS CORE by SNMP/net.if.speed[{#SNMPINDEX}])) and last(/TrueNAS CORE by SNMP/net.if.speed[{#SNMPINDEX}])>0`|Warning|**Depends on**:<br><ul><li>TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: High output error rate|<p>It recovers when it is below 80% of the `{$IF.ERRORS.WARN:"{#IFNAME}"}` threshold.</p>|`min(/TrueNAS CORE by SNMP/net.if.out.errors[{#SNMPINDEX}],5m)>{$IF.ERRORS.WARN:"{#IFNAME}"}`|Warning|**Depends on**:<br><ul><li>TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: High outbound bandwidth usage|<p>The utilization of the network interface is close to its estimated maximum bandwidth.</p>|`(avg(/TrueNAS CORE by SNMP/net.if.out[{#SNMPINDEX}],15m)>({$IF.UTIL.MAX:"{#IFNAME}"}/100)*last(/TrueNAS CORE by SNMP/net.if.speed[{#SNMPINDEX}])) and last(/TrueNAS CORE by SNMP/net.if.speed[{#SNMPINDEX}])>0`|Warning|**Depends on**:<br><ul><li>TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Ethernet has changed to lower speed than it was before|<p>This Ethernet connection has transitioned down from its known maximum speed. This might be a sign of autonegotiation issues. Acknowledge to close the problem manually.</p>|`change(/TrueNAS CORE by SNMP/net.if.speed[{#SNMPINDEX}])<0 and last(/TrueNAS CORE by SNMP/net.if.speed[{#SNMPINDEX}])>0 and ( last(/TrueNAS CORE by SNMP/net.if.type[{#SNMPINDEX}])=6 or last(/TrueNAS CORE by SNMP/net.if.type[{#SNMPINDEX}])=7 or last(/TrueNAS CORE by SNMP/net.if.type[{#SNMPINDEX}])=11 or last(/TrueNAS CORE by SNMP/net.if.type[{#SNMPINDEX}])=62 or last(/TrueNAS CORE by SNMP/net.if.type[{#SNMPINDEX}])=69 or last(/TrueNAS CORE by SNMP/net.if.type[{#SNMPINDEX}])=117 ) and (last(/TrueNAS CORE by SNMP/net.if.status[{#SNMPINDEX}])<>2)`|Info|**Depends on**:<br><ul><li>TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Link down</li></ul>|
|TrueNAS CORE: Interface [{#IFNAME}({#IFALIAS})]: Link down|<p>This trigger expression works as follows:<br>1. It can be triggered if the operations status is down.<br>2. `{$IFCONTROL:"{#IFNAME}"}=1` - a user can redefine context macro to value - 0. That marks this interface as not important. No new trigger will be fired if this interface is down.</p>|`{$IFCONTROL:"{#IFNAME}"}=1 and (last(/TrueNAS CORE by SNMP/net.if.status[{#SNMPINDEX}])=2)`|Average||

### LLD rule ZFS pools discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|ZFS pools discovery|<p>ZFS pools discovery from FREENAS-MIB.</p>|SNMP agent|truenas.zfs.pools.discovery<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|

### Item prototypes for ZFS pools discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|TrueNAS CORE: Pool [{#POOLNAME}]: Total space|<p>MIB: FREENAS-MIB</p><p>The size of the storage pool in bytes.</p>|SNMP agent|truenas.zpool.size.total[{#POOLNAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#POOL_ALLOC_UNITS}`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Used space|<p>MIB: FREENAS-MIB</p><p>The used size of the storage pool in bytes.</p>|SNMP agent|truenas.zpool.used[{#POOLNAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#POOL_ALLOC_UNITS}`</p></li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Available space|<p>MIB: FREENAS-MIB</p><p>The available size of the storage pool in bytes.</p>|SNMP agent|truenas.zpool.avail[{#POOLNAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#POOL_ALLOC_UNITS}`</p></li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Usage in %|<p>The used size of the storage pool in %.</p>|Calculated|truenas.zpool.pused[{#POOLNAME}]|
|TrueNAS CORE: Pool [{#POOLNAME}]: Health|<p>MIB: FREENAS-MIB</p><p>The current health of the containing pool, as reported by zpool status.</p>|SNMP agent|truenas.zpool.health[{#POOLNAME}]<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Read operations rate|<p>MIB: FREENAS-MIB</p><p>The number of read I/O operations sent to the pool or device, including metadata requests (averaged since system booted).</p>|SNMP agent|truenas.zpool.read.ops[{#POOLNAME}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Write operations rate|<p>MIB: FREENAS-MIB</p><p>The number of write I/O operations sent to the pool or device (averaged since system booted).</p>|SNMP agent|truenas.zpool.write.ops[{#POOLNAME}]<p>**Preprocessing**</p><ul><li>Change per second</li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Read rate|<p>MIB: FREENAS-MIB</p><p>The bandwidth of all read operations (including metadata), expressed as units per second (averaged since system booted).</p>|SNMP agent|truenas.zpool.read.bytes[{#POOLNAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#POOL_ALLOC_UNITS}`</p></li><li>Change per second</li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Write rate|<p>MIB: FREENAS-MIB</p><p>The bandwidth of all write operations, expressed as units per second (averaged since system booted).</p>|SNMP agent|truenas.zpool.write.bytes[{#POOLNAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#POOL_ALLOC_UNITS}`</p></li><li>Change per second</li></ul>|

### Trigger prototypes for ZFS pools discovery

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|TrueNAS CORE: Pool [{#POOLNAME}]: Very high space usage|<p>Two conditions should match:<br>1. The first condition - utilization of the space should be above `{$ZPOOL.PUSED.MAX.CRIT:"{#POOLNAME}"}%.`<br>2. The second condition - the pool free space is less than `{$ZPOOL.FREE.MIN.CRIT:"{#POOLNAME}"}`.</p>|`min(/TrueNAS CORE by SNMP/truenas.zpool.pused[{#POOLNAME}],5m) > {$ZPOOL.PUSED.MAX.CRIT:"{#POOLNAME}"} and last(/TrueNAS CORE by SNMP/truenas.zpool.avail[{#POOLNAME}]) < {$ZPOOL.FREE.MIN.CRIT:"{#POOLNAME}"}`|Average||
|TrueNAS CORE: Pool [{#POOLNAME}]: High space usage|<p>Two conditions should match:<br>1. The first condition - utilization of the space should be above `{$ZPOOL.PUSED.MAX.WARN:"{#POOLNAME}"}%.`<br>2. The second condition - the pool free space is less than `{$ZPOOL.FREE.MIN.WARN:"{#POOLNAME}"}`.</p>|`min(/TrueNAS CORE by SNMP/truenas.zpool.pused[{#POOLNAME}],5m) > {$ZPOOL.PUSED.MAX.WARN:"{#POOLNAME}"} and last(/TrueNAS CORE by SNMP/truenas.zpool.avail[{#POOLNAME}]) < {$ZPOOL.FREE.MIN.WARN:"{#POOLNAME}"}`|Warning|**Depends on**:<br><ul><li>TrueNAS CORE: Pool [{#POOLNAME}]: Very high space usage</li></ul>|
|TrueNAS CORE: Pool [{#POOLNAME}]: Status is not online|<p>Please check pool status.</p>|`last(/TrueNAS CORE by SNMP/truenas.zpool.health[{#POOLNAME}]) <> 0`|Average||

### LLD rule ZFS datasets discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|ZFS datasets discovery|<p>ZFS datasets discovery from FREENAS-MIB.</p>|SNMP agent|truenas.zfs.dataset.discovery<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|

### Item prototypes for ZFS datasets discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|TrueNAS CORE: Dataset [{#DATASET_NAME}]: Total space|<p>MIB: FREENAS-MIB</p><p>The size of the dataset in bytes.</p>|SNMP agent|truenas.dataset.size.total[{#DATASET_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#DATASET_ALLOC_UNITS}`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|TrueNAS CORE: Dataset [{#DATASET_NAME}]: Used space|<p>MIB: FREENAS-MIB</p><p>The used size of the dataset in bytes.</p>|SNMP agent|truenas.dataset.used[{#DATASET_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#DATASET_ALLOC_UNITS}`</p></li></ul>|
|TrueNAS CORE: Dataset [{#DATASET_NAME}]: Available space|<p>MIB: FREENAS-MIB</p><p>The available size of the dataset in bytes.</p>|SNMP agent|truenas.dataset.avail[{#DATASET_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#DATASET_ALLOC_UNITS}`</p></li></ul>|
|TrueNAS CORE: Dataset [{#DATASET_NAME}]: Usage in %|<p>The used size of the dataset in %.</p>|Calculated|truenas.dataset.pused[{#DATASET_NAME}]|

### Trigger prototypes for ZFS datasets discovery

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|TrueNAS CORE: Dataset [{#DATASET_NAME}]: Very high space usage|<p>Two conditions should match:<br>1. The first condition - utilization of the space should be above `{$DATASET.PUSED.MAX.CRIT:"{#DATASET_NAME}"}%.`<br>2. The second condition - the dataset free space is less than `{$DATASET.FREE.MIN.CRIT:"{#POOLNAME}"}`.</p>|`min(/TrueNAS CORE by SNMP/truenas.dataset.pused[{#DATASET_NAME}],5m) > {$DATASET.PUSED.MAX.CRIT:"{#DATASET_NAME}"} and last(/TrueNAS CORE by SNMP/truenas.dataset.avail[{#DATASET_NAME}]) < {$DATASET.FREE.MIN.CRIT:"{#POOLNAME}"}`|Average||
|TrueNAS CORE: Dataset [{#DATASET_NAME}]: High space usage|<p>Two conditions should match:<br>1. The first condition - utilization of the space should be above `{$DATASET.PUSED.MAX.WARN:"{#DATASET_NAME}"}%.`<br>2. The second condition - the dataset free space is less than `{$DATASET.FREE.MIN.WARN:"{#POOLNAME}"}`.</p>|`min(/TrueNAS CORE by SNMP/truenas.dataset.pused[{#DATASET_NAME}],5m) > {$DATASET.PUSED.MAX.WARN:"{#DATASET_NAME}"} and last(/TrueNAS CORE by SNMP/truenas.dataset.avail[{#DATASET_NAME}]) < {$DATASET.FREE.MIN.WARN:"{#POOLNAME}"}`|Warning|**Depends on**:<br><ul><li>TrueNAS CORE: Dataset [{#DATASET_NAME}]: Very high space usage</li></ul>|

### LLD rule ZFS volumes discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|ZFS volumes discovery|<p>ZFS volumes discovery from FREENAS-MIB.</p>|SNMP agent|truenas.zfs.zvols.discovery<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|

### Item prototypes for ZFS volumes discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|TrueNAS CORE: ZFS volume [{#ZVOL_NAME}]: Total space|<p>MIB: FREENAS-MIB</p><p>The size of the ZFS volume in bytes.</p>|SNMP agent|truenas.zvol.size.total[{#ZVOL_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#ZVOL_ALLOC_UNITS}`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|
|TrueNAS CORE: ZFS volume [{#ZVOL_NAME}]: Used space|<p>MIB: FREENAS-MIB</p><p>The used size of the ZFS volume in bytes.</p>|SNMP agent|truenas.zvol.used[{#ZVOL_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#ZVOL_ALLOC_UNITS}`</p></li></ul>|
|TrueNAS CORE: ZFS volume [{#ZVOL_NAME}]: Available space|<p>MIB: FREENAS-MIB</p><p>The available of the ZFS volume in bytes.</p>|SNMP agent|truenas.zvol.avail[{#ZVOL_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `{#ZVOL_ALLOC_UNITS}`</p></li></ul>|

### LLD rule Disks temperature discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|Disks temperature discovery|<p>Disks temperature discovery from FREENAS-MIB.</p>|SNMP agent|truenas.disk.temp.discovery<p>**Preprocessing**</p><ul><li><p>Discard unchanged with heartbeat: `6h`</p></li></ul>|

### Item prototypes for Disks temperature discovery

|Name|Description|Type|Key and additional info|
|----|-----------|----|-----------------------|
|TrueNAS CORE: Disk [{#DISK_NAME}]: Temperature|<p>MIB: FREENAS-MIB</p><p>The temperature of this HDD in mC.</p>|SNMP agent|truenas.disk.temp[{#DISK_NAME}]<p>**Preprocessing**</p><ul><li><p>Custom multiplier: `0.001`</p></li><li><p>Discard unchanged with heartbeat: `1h`</p></li></ul>|

### Trigger prototypes for Disks temperature discovery

|Name|Description|Expression|Severity|Dependencies and additional info|
|----|-----------|----------|--------|--------------------------------|
|TrueNAS CORE: Disk [{#DISK_NAME}]: Average disk temperature is too high|<p>Disk temperature is high.</p>|`avg(/TrueNAS CORE by SNMP/truenas.disk.temp[{#DISK_NAME}],5m) > {$TEMPERATURE.MAX.CRIT:"{#DISK_NAME}"}`|Average||
|TrueNAS CORE: Disk [{#DISK_NAME}]: Average disk temperature is too high|<p>Disk temperature is high.</p>|`avg(/TrueNAS CORE by SNMP/truenas.disk.temp[{#DISK_NAME}],5m) > {$TEMPERATURE.MAX.WARN:"{#DISK_NAME}"}`|Warning||

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