Meters

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Overview

Various monitoring meters are automatically created for each Joule component. They cover the actual stream, processors, transports and connected stores.

Stream

The stream monitor provides the observability in to the number of events processed within the processing pipeline as a whole. This is a useful monitor to observe to ensure events are passing through the pipeline successfully and quickly enough.

Type	Description
Queued	Number of events queued for processing
Processed	Number of events successfully processed
Failed	Number of failed events not processed by the consuming / publishing transport

Processor

Every processor has a set of metrics turned on by default.

Type	Description
Received	Number of events received by the processor before being queued
Queued	Number of events queued ready for processing
Processed	Number of events successfully processed
Discarded	Number of events discarded, dropped, from the processor which is removed from the processing pipeline
Ignored	Number of events ignored but not dropped from the processing pipeline
Failed	Number of failed events due to a processing failure

If a processor has been provided with a symbolic name within the DSL configuration a bean will be created using this name.

Transport

Every transport has these metrics turned on by default.

Type	Description
Queued	Number of events queued ready for processing
Processed	Number of events successfully processed
Failed	Number of failed events not processed by the consuming / publishing transport

If a transport has been provided with a symbolic name within the DSL configuration a bean will be created using this name.

Storage

This is a useful set of metrics to understand the I/O load of a connected store.

Type	Description
Reads	Number of reads performed on the store
Writes	Number of writes performed against the store

If a store has been provided with a symbolic name within the DSL configuration a bean will be created using this name.