Azure Monitor receiver doesn't honor time grain

[an-mmx]

Component(s)

receiver/azuremonitor

What happened?

Description

Azure monitor receiver has gaps in metrics when collecting PT1M metrics with 1 minute interval. It results in data points lost.

Steps to Reproduce

Configure Azure Monitor receiver to fetch any Azure metric with PT1M time grain

Expected Result

Metrics received for every minute without gaps: for 60 minutes receive 60 data points.

Actual Result

Some metrics are lost, for 60 minutes interval it collects roufly 40..45 data points.

Collector version

v0.117.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

exporters:
  debug:
    verbosity: detailed

processors:
  filter/azuremonitor/eventhub:
    error_mode: ignore
    metrics:
      metric:
        - 'not name == "azure_incomingmessages_total"'

receivers:
  azuremonitor/eventhub:
    subscription_id: "${env:AM_SUBSCRIPTION_ID}"
    tenant_id: "${env:AM_TENANT_ID}"
    client_id: "${env:AM_SP_CLIENT_ID}"
    client_secret: "${env:AM_SP_CLIENT_SECRET}"
    collection_interval: 1m
    initial_delay: 1s
    resource_groups:
      - ${env:AM_RESOURCE_GROUP}
    services:
      - microsoft.eventhub/namespaces

service:
  pipelines:
    metrics:
      exporters:
      - debug
      processors:
      - filter/azuremonitor/eventhub
      receivers:
      - azuremonitor/eventhub

Log output

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/azuremonitor: @nslaughter

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