how to exclude logs/events in journalbeat - elasticsearch

Question

We are using journalbeat to push logs of kubernetes cluster to elastic search. It working fine and pushing the logs. However its also pushing event like "200 OK" and "INFO" which we do not want. The journalbeat.yaml is as follows
journalbeat.yaml
journalbeat.yml: |
name: "${NODENAME}"
journalbeat.inputs:
- paths: []
seek: cursor
cursor_seek_fallback: tail
processors:
- add_kubernetes_metadata:
host: "${NODENAME}"
in_cluster: true
default_indexers.enabled: false
default_matchers.enabled: false
indexers:
- container:
matchers:
- fields:
lookup_fields: ["container.id"]
- decode_json_fields:
fields: ["message"]
process_array: false
max_depth: 1
target: ""
overwrite_keys: true
- drop_event.when:
or:
- regexp.kubernetes.pod.name: "filebeat-.*"
- regexp.kubernetes.pod.name: "journalbeat-.*"
- regexp.kubernetes.pod.name: "nginx-ingress-controller-.*"
- regexp.kubernetes.pod.name: "prometheus-operator-.*"
setup.template.enabled: false
setup.template.name: "journal-${ENVIRONMENT}-%{[agent.version]}"
setup.template.pattern: "journal-${ENVIRONMENT}-%{[agent.version]}-*"
setup.template.settings:
index.number_of_shards: 10
index.refresh_interval: 10s
output.elasticsearch:
hosts: '${ELASTICSEARCH_HOSTS:elasticsearch:9200}'
username: '${ELASTICSEARCH_USERNAME}'
password: '${ELASTICSEARCH_PASSWORD}'
index: "journal-${ENVIRONMENT}-system-%{[agent.version]}-%{+YYYY.MM.dd}"
indices:
- index: "journal-${ENVIRONMENT}-k8s-%{[agent.version]}-%{+YYYY.MM.dd}"
when.has_fields:
- 'kubernetes.namespace'
How can i exclude logs like "INFO" and "200 OK" events?

Answer 1

As far as I'm aware there is no way to exclude logs in Journalbeat. It's working other way around, meaning you tell it what input to look for.
You should read about Configuration input:
By default, Journalbeat reads log events from the default systemd journals. To specify other journal files, set the paths option in the journalbeat.inputs section of the journalbeat.yml file. Each path can be a directory path (to collect events from all journals in a directory), or a file path.
journalbeat.inputs:
- paths:
- "/dev/log"
- "/var/log/messages/my-journal-file.journal"
Within the configuration file, you can also specify options that control how Journalbeat reads the journal files and which fields are sent to the configured output. See Configuration options for a list of available options.
Get familiar with the Configuration options and using the translated fields to target the exact input you want to.
{beatname_lc}.inputs:
- id: consul.service
paths: []
include_matches:
- _SYSTEMD_UNIT=consul.service
- id: vault.service
paths: []
include_matches:
- _SYSTEMD_UNIT=vault.service
You should use it to target the inputs you want to have pushed to elastic.
As an alternative to Journalbeat you could use Filebeat and the exclude might look like this:
type: log
paths:
{{ range $i, $path := .paths }}
- {{$path}}
{{ end }}
exclude_files: [".gz$"]
exclude_lines: ['.*INFO.*']
Hope this helps you a bit.

Answer 2

To apply filter use:
logging.level: warning
Use this instruction to drop event journalbeat.service:
processors:
- drop_event:
when:
equals:
systemd.unit: "journalbeat.service"