SNMP MIB SMIv2 Conformance Group Issue - snmp

Question

I have a MIB that I started working on but smilint complains about a missing conformance group. How do I add this conformance group to my file?
BLEH-PRODUCT-MIB DEFINITIONS ::= BEGIN
-- Objects in this MIB are implemented in the local SNMP agent.
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, enterprises
FROM SNMPv2-SMI;
blehProductMIB MODULE-IDENTITY
LAST-UPDATED "201305290000Z"
ORGANIZATION "Bleh Corporation"
CONTACT-INFO " Joe Shmoe
Postal: Bleh Corporation
23 Telnet Road
Ottawa, ON, K1K 1K1
Canada
Tel: [phone] x5555
Fax: [phone]
E-mail: joe.shmoe#bleh.com"
DESCRIPTION "MIB module describing Product objects."
REVISION "201305290000Z"
DESCRIPTION "Initial"
::= { bleh 911 }
bleh OBJECT IDENTIFIER ::= { enterprises 54321 }
productStatus OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..65535))
MAX-ACCESS read-only
STATUS current
DESCRIPTION "The status of the Product system
Details are shown as text"
::= { blehProductMIB 1 }
binaryProductStatus OBJECT-TYPE
SYNTAX Integer32 (0..1)
MAX-ACCESS read-only
STATUS current
DESCRIPTION "The status of the Product system
Zero is unhealthy and One is healthy"
::= { blehProductMIB 2 }
END
Output of smilint:
$ smilint ./BLEH-PRODUCT-MIB
./BLEH-PRODUCT-MIB:28: warning: node `productStatus' must be contained in at least one conformance group
./BLEH-PRODUCT-MIB:37: warning: node `binaryProductStatus' must be contained in at least one conformance group

Answer 1

It simply means you should define OBJECT-GROUP entities before defining OBJECT-TYPE entities in your MIB document.
Take RFC 1907 as example,
https://www.rfc-editor.org/rfc/rfc1907
snmpGroup OBJECT-GROUP
OBJECTS { snmpInPkts,
snmpInBadVersions,
snmpInASNParseErrs,
snmpSilentDrops,
snmpProxyDrops,
snmpEnableAuthenTraps }
STATUS current
DESCRIPTION
"A collection of objects providing basic instrumentation and
control of an SNMPv2 entity."
::= { snmpMIBGroups 8 }
is defined first, and then
snmpInPkts OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of messages delivered to the SNMP entity
from the transport service."
::= { snmp 1 }
About why groups are important, you can read RFC 2580.
https://www.rfc-editor.org/rfc/rfc2580
Since you are going to define groups, then adding associated MODULE-COMPLIANCE is recommended.

Answer 2

This comes a bit late but I was lately struggling with how OBJECT-GROUP, NOTIFICATION-GROUP, MODULE-COMPLIANCE. smilint was giving me errors. Then I just put all the pieces together and created this. Now it passes even with the autistic smilint -l 6
TEMPORARY-RESEARCH-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, enterprises, Integer32, NOTIFICATION-TYPE FROM SNMPv2-SMI
OBJECT-GROUP, NOTIFICATION-GROUP, MODULE-COMPLIANCE FROM SNMPv2-CONF;
exampleCorp MODULE-IDENTITY
LAST-UPDATED "202111241500Z"
ORGANIZATION
"Example corp ltd"
CONTACT-INFO
"Example corp address"
DESCRIPTION
"This MIB file contains definitions for the
Example corps next coolest product!"
REVISION "202111241500Z"
DESCRIPTION
"MIB file created"
::= { enterprises 55555 }
theSystem OBJECT IDENTIFIER ::= { exampleCorp 10 }
mibMeta OBJECT IDENTIFIER ::= { theSystem 1 }
productTypeOne OBJECT IDENTIFIER ::= { theSystem 2 }
productObjects OBJECT-GROUP
OBJECTS {
devTempAlarm,
devVoltAlarm
}
STATUS current
DESCRIPTION
"A collection of objects providing support for
the system MIB."
::= { mibMeta 1 }
productNotifications NOTIFICATION-GROUP
NOTIFICATIONS {
problemsTrap
}
STATUS current
DESCRIPTION
"A collection of notifications providing support for
the system MIB."
::= { mibMeta 2 }
productCompliances MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for the the entities in this (theSystem) MIB."
MODULE
MANDATORY-GROUPS {
productObjects,
productNotifications
}
::= { mibMeta 3 }
-- Traps parent need to be always SOMEOID.0.
-- Ie, the zero is important.
trapsOne OBJECT IDENTIFIER ::= { productTypeOne 0 }
problemsTrap NOTIFICATION-TYPE
STATUS current
DESCRIPTION
"This trap is send automatically if problems are detected."
::= { trapsOne 1 }
trapDataTable OBJECT-TYPE
SYNTAX SEQUENCE OF DevEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The table of Devices."
::= { productTypeOne 1 }
trapDataTableEntry OBJECT-TYPE
SYNTAX DevEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The entry to show a row of device information."
INDEX { devIndex }
::= { trapDataTable 1 }
DevEntry ::= SEQUENCE {
devIndex Integer32,
devTempAlarm Integer32,
devVoltAlarm Integer32
}
devIndex OBJECT-TYPE
SYNTAX Integer32(1..5)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A unique value to index the device."
::= { trapDataTableEntry 1 }
devTempAlarm OBJECT-TYPE
SYNTAX Integer32(0..1)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The state of the device temperature alarm:
0 = Alarm OFF,
1 = Alarm ON"
::= { trapDataTableEntry 2 }
devVoltAlarm OBJECT-TYPE
SYNTAX Integer32(0..1)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The state of the device voltage alarm:
0 = Alarm OFF,
1 = Alarm ON"
::= { trapDataTableEntry 3 }
END