Yes. The prometheus server is configured to communicate with all
alertmanagers ( sorry there are 8 alertmanagers ):
alerting:
alert_relabel_configs:
- action: labeldrop
regex: "^prometheus_server$"
alertmanagers:
- static_configs:
- targets:
- alertmanager1:9093
- alertmanager2:9093
- alertmanager3:9093
- alertmanager4:9093
- alertmanager5:9093
- alertmanager6:9093
- alertmanager7:9093
- alertmanager8:9093
On Friday, January 13, 2023 at 2:02:14 PM UTC+1 Brian Candler wrote:
> Yes, but have you configured the prometheus (the one which has alerting
> rules) to have all four alertmanagers as its destination?
>
> On Friday, 13 January 2023 at 12:55:49 UTC LukaszSz wrote:
>
>> Yes Brian. As I mentioned in my post the Alertmangers are in cluster and
>> this event is visible on my 4 alertmanagers.
>> Problem which I described is that an alerts are firing twice and it
>> generates duplication.
>>
>> On Friday, January 13, 2023 at 1:34:52 PM UTC+1 Brian Candler wrote:
>>
>>> Are the alertmanagers clustered? Then you should configure prometheus
>>> to deliver the alert to *all* alertmanagers.
>>>
>>> On Friday, 13 January 2023 at 11:08:37 UTC LukaszSz wrote:
>>>
>>>> Hi guys,
>>>>
>>>> I have Prometheus in HA mode - 4 nodes - Prometheus+Aletmanager on
>>>> each.
>>>> Everything works fine but very often I experience issue that an alert
>>>> is firing again even the event is already resolved by alertmanager.
>>>>
>>>> Below logs from example event(Chrony_Service_Down) recorded by
>>>> alertmanager:
>>>>
>>>>
>>>> ############################################################################################################
>>>> (1) Jan 10 10:48:48 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:48:48.746Z caller=dispatch.go:165 level=debug
>>>> component=dispatcher msg="Received alert"
>>>> alert=Chrony_Service_Down[d8c020a][active]
>>>>
>>>> (2) Jan 10 10:49:19 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:49:19.460Z caller=nflog.go:553 level=debug
>>>> component=nflog
>>>> msg="gossiping new entry"
>>>> entry="entry:<group_key:\"{}/{severity=\\\"page\\\"}:{alertname=\\\"Chrony_Service_Down\\\",
>>>>
>>>> datacenter=\\\"dc01\\\", exporter=\\\"node\\\", fqdn=\\\"
>>>> server.example.com\\\", instance=\\\"server.example.com\\\",
>>>> job=\\\"node\\\", monitoring_infra=\\\"prometheus-mon\\\",
>>>> puppet_certname=\\\"server.example.com\\\", service=\\\"chrony\\\",
>>>> severity=\\\"page\\\"}\" receiver:<group_name:\"opsgenie\"
>>>> integration:\"opsgenie\" > timestamp:<seconds:1673347759 nanos:262824014 >
>>>> firing_alerts:10151928354614242630 > expires_at:<seconds:1673779759
>>>> nanos:262824014 > "
>>>>
>>>> (3) Jan 10 10:50:48 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:50:48.745Z caller=dispatch.go:165 level=debug
>>>> component=dispatcher msg="Received alert"
>>>> alert=Chrony_Service_Down[d8c020a][resolved]
>>>>
>>>> (4) Jan 10 10:51:29 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:51:29.183Z caller=nflog.go:553 level=debug
>>>> component=nflog
>>>> msg="gossiping new entry"
>>>> entry="entry:<group_key:\"{}/{severity=\\\"page\\\"}:{alertname=\\\"Chrony_Service_Down\\\",
>>>>
>>>> datacenter=\\\"dc01\\\", exporter=\\\"node\\\", fqdn=\\\"
>>>> server.example.com\\\", instance=\\\"server.example.com\\\",
>>>> job=\\\"node\\\", monitoring_infra=\\\"prometheus-mon\\\",
>>>> puppet_certname=\\\"server.example.com\\\", service=\\\"chrony\\\",
>>>> severity=\\\"page\\\"}\" receiver:<group_name:\"opsgenie\"
>>>> integration:\"opsgenie\" > timestamp:<seconds:1673347888 nanos:897562679 >
>>>> resolved_alerts:10151928354614242630 > expires_at:<seconds:1673779888
>>>> nanos:897562679 > "
>>>>
>>>> (5) Jan 10 10:51:49 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:51:49.745Z caller=nflog.go:553 level=debug
>>>> component=nflog
>>>> msg="gossiping new entry"
>>>> entry="entry:<group_key:\"{}/{severity=\\\"page\\\"}:{alertname=\\\"Chrony_Service_Down\\\",
>>>>
>>>> datacenter=\\\"dc01\\\", exporter=\\\"node\\\", fqdn=\\\"
>>>> server.example.com\\\", instance=\\\"server.example.com\\\",
>>>> job=\\\"node\\\", monitoring_infra=\\\"prometheus-mon\\\",
>>>> puppet_certname=\\\"server.example.com\\\", service=\\\"chrony\\\",
>>>> severity=\\\"page\\\"}\" receiver:<group_name:\"opsgenie\"
>>>> integration:\"opsgenie\" > timestamp:<seconds:1673347909 nanos:649205670 >
>>>> firing_alerts:10151928354614242630 > expires_at:<seconds:1673779909
>>>> nanos:649205670 > "
>>>>
>>>> (6) Jan 10 10:51:59 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:51:59.312Z caller=nflog.go:553 level=debug
>>>> component=nflog
>>>> msg="gossiping new entry"
>>>> entry="entry:<group_key:\"{}/{severity=\\\"page\\\"}:{alertname=\\\"Chrony_Service_Down\\\",
>>>>
>>>> datacenter=\\\"dc01\\\", exporter=\\\"node\\\", fqdn=\\\"
>>>> server.example.com\\\", instance=\\\"server.example.com\\\",
>>>> job=\\\"node\\\", monitoring_infra=\\\"prometheus-mon\\\",
>>>> puppet_certname=\\\"server.example.com\\\", service=\\\"chrony\\\",
>>>> severity=\\\"page\\\"}\" receiver:<group_name:\"opsgenie\"
>>>> integration:\"opsgenie\" > timestamp:<seconds:1673347919 nanos:137020780 >
>>>> resolved_alerts:10151928354614242630 > expires_at:<seconds:1673779919
>>>> nanos:137020780 > "
>>>>
>>>> (7) Jan 10 10:54:58 prometheus-01 alertmanager[1213219]:
>>>> ts=2023-01-10T10:54:58.744Z caller=dispatch.go:165 level=debug
>>>> component=dispatcher msg="Received alert"
>>>> alert=Chrony_Service_Down[d8c020a][resolved]
>>>>
>>>> #############################################################################################################
>>>>
>>>> Interesting is line number 5 (Jan 10 10:51:49) where alertmanager fired
>>>> alert second time even minute ago (Jan 10 10:50:48) the alert was marked
>>>> as
>>>> resolved.
>>>> Such behavior generates duplicate alert in our system which is quite
>>>> annoying in our scale.
>>>>
>>>> What is worth to mention:
>>>> - For test purpose the event is scrapped by 4 Promethues
>>>> servers(default) but alert rule is evaluated by one Promethues.
>>>> - The event occurres only once so there is no flapping which might
>>>> cause another alert firing.
>>>>
>>>> Thanks
>>>>
>>>
--
You received this message because you are subscribed to the Google Groups
"Prometheus Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/prometheus-users/b5269318-7ed4-4aa0-9224-0679af6e1d9cn%40googlegroups.com.
