Apache Pulsar

Plugin: go.d.plugin Module: pulsar

Overview

This collector monitors Pulsar servers.

It collects broker statistics using Pulsar's Prometheus endpoint.

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior

Auto-Detection

By default, it detects Pulsar instances running on localhost.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

• topic_* metrics are available when exposeTopicLevelMetricsInPrometheus is set to true.
• subscription_* and namespace_subscription metrics are available when exposeTopicLevelMetricsInPrometheus si set to true.
• replication* and namespace_replication* metrics are available when replication is configured and replicationMetricsEnabled is set to true.

Per Apache Pulsar instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
pulsar.broker_components	namespaces, topics, subscriptions, producers, consumers	components
pulsar.messages_rate	publish, dispatch	messages/s
pulsar.throughput_rate	publish, dispatch	KiB/s
pulsar.storage_size	used	KiB
pulsar.storage_operations_rate	read, write	message batches/s
pulsar.msg_backlog	backlog	messages
pulsar.storage_write_latency	<=0.5ms, <=1ms, <=5ms, =10ms, <=20ms, <=50ms, <=100ms, <=200ms, <=1s, >1s	entries/s
pulsar.entry_size	<=128B, <=512B, <=1KB, <=2KB, <=4KB, <=16KB, <=100KB, <=1MB, >1MB	entries/s
pulsar.subscription_delayed	delayed	message batches
pulsar.subscription_msg_rate_redeliver	redelivered	messages/s
pulsar.subscription_blocked_on_unacked_messages	blocked	subscriptions
pulsar.replication_rate	in, out	messages/s
pulsar.replication_throughput_rate	in, out	KiB/s
pulsar.replication_backlog	backlog	messages

Per namespace

TBD

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
pulsar.namespace_broker_components	topics, subscriptions, producers, consumers	components
pulsar.namespace_messages_rate	publish, dispatch	messages/s
pulsar.namespace_throughput_rate	publish, dispatch	KiB/s
pulsar.namespace_storage_size	used	KiB
pulsar.namespace_storage_operations_rate	read, write	message batches/s
pulsar.namespace_msg_backlog	backlog	messages
pulsar.namespace_storage_write_latency	<=0.5ms, <=1ms, <=5ms, =10ms, <=20ms, <=50ms, <=100ms, <=200ms, <=1s, >1s	entries/s
pulsar.namespace_entry_size	<=128B, <=512B, <=1KB, <=2KB, <=4KB, <=16KB, <=100KB, <=1MB, >1MB	entries/s
pulsar.namespace_subscription_delayed	delayed	message batches
pulsar.namespace_subscription_msg_rate_redeliver	redelivered	messages/s
pulsar.namespace_subscription_blocked_on_unacked_messages	blocked	subscriptions
pulsar.namespace_replication_rate	in, out	messages/s
pulsar.namespace_replication_throughput_rate	in, out	KiB/s
pulsar.namespace_replication_backlog	backlog	messages
pulsar.topic_producers	a dimension per topic	producers
pulsar.topic_subscriptions	a dimension per topic	subscriptions
pulsar.topic_consumers	a dimension per topic	consumers
pulsar.topic_messages_rate_in	a dimension per topic	publishes/s
pulsar.topic_messages_rate_out	a dimension per topic	dispatches/s
pulsar.topic_throughput_rate_in	a dimension per topic	KiB/s
pulsar.topic_throughput_rate_out	a dimension per topic	KiB/s
pulsar.topic_storage_size	a dimension per topic	KiB
pulsar.topic_storage_read_rate	a dimension per topic	message batches/s
pulsar.topic_storage_write_rate	a dimension per topic	message batches/s
pulsar.topic_msg_backlog	a dimension per topic	messages
pulsar.topic_subscription_delayed	a dimension per topic	message batches
pulsar.topic_subscription_msg_rate_redeliver	a dimension per topic	messages/s
pulsar.topic_subscription_blocked_on_unacked_messages	a dimension per topic	blocked subscriptions
pulsar.topic_replication_rate_in	a dimension per topic	messages/s
pulsar.topic_replication_rate_out	a dimension per topic	messages/s
pulsar.topic_replication_throughput_rate_in	a dimension per topic	messages/s
pulsar.topic_replication_throughput_rate_out	a dimension per topic	messages/s
pulsar.topic_replication_backlog	a dimension per topic	messages

Alerts

There are no alerts configured by default for this integration.

Setup

Prerequisites

No action required.

Configuration

File

The configuration file name for this integration is go.d/pulsar.conf.

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/pulsar.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	1	no
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	no
url	Server URL.	http://127.0.0.1:8080/metrics	yes
timeout	HTTP request timeout.	1	no
username	Username for basic HTTP authentication.		no
password	Password for basic HTTP authentication.		no
proxy_url	Proxy URL.		no
proxy_username	Username for proxy basic HTTP authentication.		no
proxy_password	Password for proxy basic HTTP authentication.		no
method	HTTP request method.	GET	no
body	HTTP request body.		no
headers	HTTP request headers.		no
not_follow_redirects	Redirect handling policy. Controls whether the client follows redirects.	no	no
tls_skip_verify	Server certificate chain and hostname validation policy. Controls whether the client performs this check.	no	no
tls_ca	Certification authority that the client uses when verifying the server's certificates.		no
tls_cert	Client TLS certificate.		no
tls_key	Client TLS key.		no

Examples

Basic

A basic example configuration.

jobs:
  - name: local
    url: http://127.0.0.1:8080/metrics

HTTP authentication

Basic HTTP authentication.

Config

jobs:
  - name: local
    url: http://127.0.0.1:8080/metrics
    username: username
    password: password

HTTPS with self-signed certificate

Do not validate server certificate chain and hostname.

Config

jobs:
  - name: local
    url: https://127.0.0.1:8080/metrics
    tls_skip_verify: yes

Multi-instance

Note: When you define multiple jobs, their names must be unique.

Collecting metrics from local and remote instances.

Config

jobs:
  - name: local
    url: http://127.0.0.1:8080/metrics

  - name: remote
    url: http://192.0.2.1:8080/metrics

Troubleshooting

Debug Mode

Important: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.

To troubleshoot issues with the pulsar collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m pulsar

Getting Logs

If you're encountering problems with the pulsar collector, follow these steps to retrieve logs and identify potential issues:

• Run the command specific to your system (systemd, non-systemd, or Docker container).
• Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.

System with systemd

Use the following command to view logs generated since the last Netdata service restart:

journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep pulsar

System without systemd

Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector's name:

grep pulsar /var/log/netdata/collector.log

Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.

Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

docker logs netdata 2>&1 | grep pulsar