i’am monitoring my fortigate 200D using snmp_exporter i got problem wh:
-snmp_exporter status is working but snmpwalk -c public -v2c x.x.x.x.x show Timeout no response
-then i got that error :
snmp_exporter[7974]: level=info ts=2020-04-22T12:06:47.755Z caller=collector.go:216 module=if_mib target=172.16.0.240 msg=“Error scraping target” err=“error getting target 172.16.0.240: context canceled”
Some help please 
