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Example code of grzegorzdrozd/opentelemetry-metrics-pdo

Informations about the package opentelemetry-metrics-pdo

OpenTelemetry metrics for PDO

Please read https://opentelemetry.io/docs/concepts/signals/metrics/ for basic information about metrics. .

Overview

Metric collection is installed via Composer, and metrics are sent using default collector for selected PDO operations.

Configuration

You can disable the extension using runtime configuration:

Recommended OTEL Metrics settings:

Use this setting to send all data like spanId, traceId, and attributes with metric value.

To make sure that all metrics are sent and not pre-processed before it is best to send this to delta. Otherwise, metrics like db.client.connection.count will always send 0 instead of +1 when connection is established and -1 when connection is closed. This metric is specially useful in long-running code that runs from cli like console commands or cron jobs. But it also contains both timestamps — one for connection increase, and one for connection number decrease. Combined with flushing from time to time (more often than on the script end) will show current number of established db connections. To force flush, you can use this in one of the console events or somewhere in your processing loop:

Adding Custom Attributes

You can add custom attributes to your PDO metrics either globally or per specific PDO/PDOStatement instance. The following methods are available:

These attributes will be included with all metrics generated for the relevant scope (global or instance-specific). Instance-specific attributes are combined with global attributes when metrics are generated.

This is useful for tracking information that might be lost from spans due to sampling on traces.

Additional configuration options

Disable context tracking

If you don't want to add traceId and spanId to metrics, you can disable it using the following env variable (it is enabled by default):

Disable adding statements to metrics

If you don't want to add a statement to metrics, you can disable it using the following env variable (it is enabled by default):

Disable tracking number of returned rows

If you don't want to send the number of returned rows (as a separate, histogram metric), you can disable it using the following env variable (it is enabled by default):

All versions of opentelemetry-metrics-pdo with dependencies

PHP Build Version
Package Version
Requires ext-opentelemetry Version *
ext-pdo Version *
open-telemetry/api Version ^1.0
open-telemetry/exporter-otlp Version ^1.2
open-telemetry/sem-conv Version ^1.24
php Version ^8.2
guzzlehttp/guzzle Version ^7.9
guzzlehttp/psr7 Version ^2.7
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