The configuration for the snmp_exporter you posted doesn't look right. The 
first line (after the comment), looks like this:

*-- apcups: -- MODULE-IDENTITY walk: -- OrgName - 1.3.6.1.2.1.2 -- Fortinet 
Technologies, Inc.  - 1.3.6.1.4.1.318.1.1.1.12 -- ContactInfo - 
1.3.6.1.4.1.318.1.1.1.2 -- Technical Support -*

This isn't correct yaml. The leading dashes are unusual, and it looks like 
there are a lot of missing newlines and indentation. Refer to this example.
https://github.com/prometheus/snmp_exporter/blob/master/snmp.yml

Also, I'm not sure whether that prometheus configuration is the entire 
configuration. You are posting your scrape configuration, but it isn't 
under the top-level scrape_configuration field. That may be an issue.
On Tuesday, October 13, 2020 at 9:28:01 AM UTC-7 [email protected] wrote:

> i'am using prometheus+snmp_exporter to monitor my fortigate
> it was all running good when suddenly tried to add another snmp target but 
> i got a problem on prometheus status !
> i deleted the new target and restarting prometheus as well as 
> snmp_exporter but suddenly i got another error with snp_exporter service :
>
> *prometheus.yml*
>
> *- job_name: 'snmp'*
> *    scrape_interval: 50s*
> *    scrape_timeout: 50s*
> *    static_configs:*
> *      - targets:*
> *        - 197.13.50.186*
> *    metrics_path: /snmp*
> *    params:*
> *      module: [if_mib]*
> *    relabel_configs:*
> *      - source_labels: [__address__]*
> *        target_label: __param_target*
> *      - source_labels: [__param_target]*
> *        target_label: instance*
> *      - target_label: __address__*
> *        replacement: grafana.so.com:9116 <http://grafana.so.com:9116>  # 
> The SNMP exporter's real hostname:port.*
>
> *journalctl -eu snmp_exporter shows:*
>
> level=error ts=2020-10-13T16:22:53.930Z caller=main.go:156 msg="Error 
> parsing config file" err="yaml: line 2: mapping values are not allowed in 
> this context"
>
> *snmp.yml: *
>
> *# WARNING: This file was auto-generated using snmp_exporter generator, 
> manual changes will be lost.*
> *-- apcups: -- MODULE-IDENTITY walk: -- OrgName - 1.3.6.1.2.1.2 -- 
> Fortinet Technologies, Inc.  - 1.3.6.1.4.1.318.1.1.1.12 -- ContactInfo - 
> 1.3.6.1.4.1.318.1.1.1.2 -- Technical Support -*
> *1.3.6.1.4.1.318.1.1.1.3 -- e-mail: [email protected] - 
> 1.3.6.1.4.1.318.1.1.1.4 -- http://www.fortinet.com 
> <http://www.fortinet.com> - 1.3.6.1.4.1.318.1.1.1.7.2 -- - 
> 1.3.6.1.4.1.318.1.1.10.2.3.2*
> *  - 1.3.6.1.4.1.318.1.1.26.8.3 FORTINET-FORTIGATE-MIB DEFINITIONS ::= 
> BEGIN get:*
> *  - 1.3.6.1.2.1.1.3.0 IMPORTS - 1.3.6.1.4.1.318.1.1.1.8.1.0*
> *    FnBoolState, FnIndex, fnAdminEntry, fnSysSerial, fortinet metrics:*
> *        FROM FORTINET-CORE-MIB - name: sysUpTime*
> *    ifEntry, ifName, ifIndex oid: 1.3.6.1.2.1.1.3*
> *        FROM IF-MIB type: gauge*
> *    InetAddress, InetAddressPrefixLength, InetAddressType, InetPortNumber 
> help: The time (in hundredths of a second) since the network management 
> portion*
> *        FROM INET-ADDRESS-MIB of the system was last re-initialized. - 
> 1.3.6.1.2.1.1.3*
> *    MODULE-COMPLIANCE, NOTIFICATION-GROUP, OBJECT-GROUP - name: ifNumber*
> *        FROM SNMPv2-CONF oid: 1.3.6.1.2.1.2.1*
> *    sysName type: gauge*
> *        FROM SNMPv2-MIB help: The number of network interfaces 
> (regardless of their current state) present*
> *    Counter32, Counter64, Gauge32, Unsigned32, Integer32, IpAddress, on 
> this system. - 1.3.6.1.2.1.2.1*
> *    MODULE-IDENTITY, NOTIFICATION-TYPE, OBJECT-TYPE, TimeTicks, 
> OBJECT-IDENTITY - name: ifIndex*
> *        FROM SNMPv2-SMI oid: 1.3.6.1.2.1.2.2.1.1*
> *    Ipv6Address type: gauge*
> *        FROM IPV6-TC help: A unique value, greater than zero, for each 
> interface - 1.3.6.1.2.1.2.2.1.1*
> *    CounterBasedGauge64 indexes:*
> *        FROM HCNUM-TC - labelname: ifIndex*
> *    DisplayString, TEXTUAL-CONVENTION, AutonomousType, DateAndTime, 
> PhysAddress type: gauge*
> *        FROM SNMPv2-TC; - name: ifDescr*
> *    oid: 1.3.6.1.2.1.2.2.1.2 fnFortiGateMib MODULE-IDENTITY type: 
> DisplayString*
> *    LAST-UPDATED "201704050000Z" help: A textual string containing 
> information about the interface - 1.3.6.1.2.1.2.2.1.2*
> *    ORGANIZATION indexes:*
> *        "Fortinet Technologies, Inc."  - labelname: ifIndex*
> *    CONTACT-INFO type: gauge*
> *        " - name: ifType*
> *         Technical Support oid: 1.3.6.1.2.1.2.2.1.3*
> *         email: [email protected] type: EnumAsInfo*
> *         http://www.fortinet.com <http://www.fortinet.com>" help: The 
> type of interface - 1.3.6.1.2.1.2.2.1.3*
> *    DESCRIPTION indexes:*
> *        "Added fgInternalLTEModemsInfo under fnFortiGateMib, Added Modem, 
> SIM card, Signal Info, - labelname: ifIndex*
> *        Traffic Info, Data Session Info OIDs."  type: gauge*
> *    REVISION "201704050000Z" enum_values:*
> *    DESCRIPTION 1: other*
> *        "Added extended database version OIDs for AV and IPS."  2: 
> regular1822*
> *    REVISION "201701160000Z" 3: hdh1822*
> *    DESCRIPTION 4: ddnX25*
> *        "Added fgFwIppools OIDs."  5: rfc877x25*
> *    REVISION "201609150000Z" 6: ethernetCsmacd*
> *    DESCRIPTION 7: iso88023Csmacd*
> *        "Various non-monotonically increase Counter32 values have been 
> changed to Gauge32."  8: iso88024TokenBus*
> *    REVISION "201606170000Z" 9: iso88025TokenRing*
> *    DESCRIPTION 10: iso88026Man*
> *        "Added fgProcessorFnNP6 in fgProcessorTypes."  11: starLan*
> *    REVISION "201504230000Z" 12: proteon10Mbit*
> *    DESCRIPTION 13: proteon80Mbit*
> *         "Added fgDevice OIDs" 14: hyperchannel*
>
>
> some help please !!!
>

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