Duplicated jobs for logs when using log_slots

[chanchiwai-ray]

Bug Description

When I am trying to use the log_slots for a snap that provides two slots, for example,

# in snapcraft.yaml
...
slots:
  ovn-logs:
    interface: content
    source:
      read:
        - $SNAP_COMMON/log/ovn
  ovs-logs:
    interface: content
    source:
      read:
        - $SNAP_COMMON/log/openvswitch 
...

and in the charm, I used the slots:

# in ./src/charm.py
self._grafana_agent = COSAgentProvider(
    ...
    log_slots=["openstack-hypervisor:ovn-logs", "openstack-hypervisor:ovs-logs"],
    ...
)

The logs section of /etc/grafana-agent.yaml contains duplicated jobs:

logs:
    ...
    - job_name: openstack-hypervisor
      pipeline_stages:
      - drop:
          expression: .*file is a directory.*
      relabel_configs:
      - replacement: /openvswitch
        source_labels:
        - __path__
        target_label: path
      static_configs:
      - labels:
          __path__: /snap/grafana-agent/13/shared-logs/openvswitch/**
          job: openstack-hypervisor
          juju_model: controller
          juju_model_uuid: d451ba9f-c875-4845-8564-adc06a1880a7
        targets:
        - localhost
    - job_name: openstack-hypervisor
      pipeline_stages:
      - drop:
          expression: .*file is a directory.*
      relabel_configs:
      - replacement: /openvswitch
        source_labels:
        - __path__
        target_label: path
      static_configs:
      - labels:
          __path__: /snap/grafana-agent/13/shared-logs/openvswitch/**
          job: openstack-hypervisor
          juju_model: controller
          juju_model_uuid: d451ba9f-c875-4845-8564-adc06a1880a7
        targets:
        - localhost

To Reproduce

See bug description

Environment

N/A

Relevant log output

N/A

Additional context

No response

[jneo8]

Define multiple source in same slots is also not working.

snapcraft.yaml

slots:
  service-logs:
    interface: content
    content: service-logs
    source:
      read:
        - $SNAP_COMMON/log/ovn
        - $SNAP_COMMON/log/openvswitch
        - $SNAP_COMMON/log/ovn/ovn-controller.log

/var/lib/snapd/mount/snap.grafana-agent.fstab

/var/snap/openstack-hypervisor/common/log/ovn /snap/grafana-agent/13/shared-logs/ovn none bind,ro 0 0
/var/snap/openstack-hypervisor/common/log/openvswitch /snap/grafana-agent/13/shared-logs/openvswitch none bind,ro 0 0
/var/snap/openstack-hypervisor/common/log/ovn/ovn-controller.log /snap/grafana-agent/13/shared-logs/ovn-controller.log none bind,ro 0 0

/etc/grafana-agent.yaml

    - job_name: openstack-hypervisor
      pipeline_stages:
      - drop:
          expression: .*file is a directory.*
      relabel_configs:
      - replacement: /openvswitch
        source_labels:
        - __path__
        target_label: path
      static_configs:
      - labels:
          __path__: /snap/grafana-agent/13/shared-logs/openvswitch/**
          job: openstack-hypervisor
          juju_model: controller
          juju_model_uuid: 010ca2a4-3209-44df-8471-d058ae9e0ee5
        targets:
        - localhost

This somehow block the scenario that that user want to collect multiple service log in the same snap.

[Abuelodelanada]

Hi @chanchiwai-ray

What is the snap you are using?
May you provide a bundle in order to reproduce the same situation?

[chanchiwai-ray]

Hi @Abuelodelanada , I don't have the bundle to reproduce the situation, since we developing and building the charm locally. However, I created a simple snap and simple charm to reproduce it: https://github.com/chanchiwai-ray/grafana-agent-k8s-operator/tree/issue/234/grafana_agent_234. Following the "README.md" you should be able to reproduce the duplicated log configs.

[dragomirp]

The Postgresql VM charm also seems to be affected by this. We have multiple sources in the logging slot:

slots:
  logs:
    interface: content
    source:
      read:
        - $SNAP_COMMON/var/log/patroni
        - $SNAP_COMMON/var/log/postgresql
        - $SNAP_COMMON/var/log/pgbackrest
        - $SNAP_COMMON/var/log/pgbouncer

We only get a single job in /etc/grafana.conf:

    - job_name: charmed-postgresql
      pipeline_stages:
      - drop:
          expression: .*file is a directory.*
      relabel_configs:
      - replacement: /postgresql
        source_labels:
        - __path__
        target_label: path
      static_configs:
      - labels:
          __path__: /snap/grafana-agent/13/shared-logs/postgresql/**
          job: charmed-postgresql
          juju_model: pg
          juju_model_uuid: 372cccb6-59f5-448b-8db6-93df5b88d48e
        targets:
        - localhost

And the contents of /var/lib/snapd/mount/snap.grafana-agent.fstab don't seem to be mounted on /snap/grafana-agent/13/shared-logs/.

It should be reproducible by deploying postgresql from channel 14/edge

[simskij]

The Postgresql VM charm also seems to be affected by this. We have multiple sources in the logging slot:

slots:
  logs:
    interface: content
    source:
      read:
        - $SNAP_COMMON/var/log/patroni
        - $SNAP_COMMON/var/log/postgresql
        - $SNAP_COMMON/var/log/pgbackrest
        - $SNAP_COMMON/var/log/pgbouncer

We only get a single job in /etc/grafana.conf:

    - job_name: charmed-postgresql
      pipeline_stages:
      - drop:
          expression: .*file is a directory.*
      relabel_configs:
      - replacement: /postgresql
        source_labels:
        - __path__
        target_label: path
      static_configs:
      - labels:
          __path__: /snap/grafana-agent/13/shared-logs/postgresql/**
          job: charmed-postgresql
          juju_model: pg
          juju_model_uuid: 372cccb6-59f5-448b-8db6-93df5b88d48e
        targets:
        - localhost

And the contents of /var/lib/snapd/mount/snap.grafana-agent.fstab don't seem to be mounted on /snap/grafana-agent/13/shared-logs/.

It should be reproducible by deploying postgresql from channel 14/edge

@Abuelodelanada ☝🏼

[shayancanonical]

The MySQL and MySQLRouter VM charms are also affected by this bug. SImilar to postgres above:

slots:
  logs:
    interface: content
    source:
      read:
        - $SNAP_COMMON/var/log/mysql
        - $SNAP_COMMON/var/log/mysqlrouter

In /etc/grafana-agent.yaml

    - job_name: charmed-mysql
      pipeline_stages:
      - drop:
          expression: .*file is a directory.*
      relabel_configs:
      - replacement: /mysql
        source_labels:
        - __path__
        target_label: path
      static_configs:
      - labels:
          __path__: /snap/grafana-agent/16/shared-logs/mysql/**
          job: charmed-mysql
          juju_model: database
          juju_model_uuid: e14f3b7b-e352-4342-80c8-2d93c5ee2984
        targets:
        - localhost

The code is in PR form, but will soon be merged to release for edge