MON-2727: Adds telemeter alert TelemeterClientFailures

[JoaoBraveCoding]

Issue: https://issues.redhat.com/browse/MON-2727

Problem: in-cluster admins and folks monitoring submitted Insights should have a way to figure out that the cluster is trying and failing to submit Telemetry.

Solution: alert that will trigger when the rate of failed requests reaches a total of 20% of the total rate of requests in a 15 min window

• I added CHANGELOG entry for this change.
• No user facing changes, so no entry in CHANGELOG was needed.

[JoaoBraveCoding]

/skip

[simonpasquier]

/lgtm

[simonpasquier]

/label px-approved
/label docs-approved

For QE approval
/assign @juzhao

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoaoBraveCoding, simonpasquier

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[juzhao]

checked with PR, used unauthorized token, since we pushed all metrics in one request, the maximum value for the TelemeterClientFailures expression is 1

# oc logs -n openshift-monitoring deployment.apps/telemeter-client -c telemeter-client
...
level=error caller=forwarder.go:276 ts=2022-10-28T04:03:07.684944851Z component=forwarder/worker msg="unable to forward results" err="unable to authorize to server: unable to exchange initial token for a long lived token: 404:\nnot found\n"
level=error caller=forwarder.go:276 ts=2022-10-28T04:04:07.752467672Z component=forwarder/worker msg="unable to forward results" err="unable to authorize to server: unable to exchange initial token for a long lived token: 404:\nnot found\n"

and

# token=`oc create token prometheus-k8s -n openshift-monitoring`
# c -n openshift-monitoring exec -c prometheus prometheus-k8s-0 -- curl -k -H "Authorization: Bearer $token" 'https://thanos-querier.openshift-monitoring.svc:9091/api/v1/query?' --data-urlencode 'query=sum by (namespace) (rate(federate_requests_failed_total{job="telemeter-client"}[15m])) / sum by (namespace) (rate(federate_requests_total{job="telemeter-client"}[15m]))' | jq
{
  "status": "success",
  "data": {
    "resultType": "vector",
    "result": [
      {
        "metric": {
          "namespace": "openshift-monitoring"
        },
        "value": [
          1666929885.827,
          "1"
        ]
      }
    ]
  }
}

[juzhao]

/label qe-approved

[openshift-ci]

@JoaoBraveCoding: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/versions	f7a2ab1	link	false	/test versions

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[jan--f]

/retest