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Log Management · head to head

Azure Monitor vs Loki

Azure Monitor logo

Azure Monitor

Log Management

Azure's Monitoring and Diagnostics Service

From
Free
Rated
-
Full reviewWebsite
Loki logo

Loki

Log Management

Like Prometheus but for Logs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Azure Monitor billed per GB ingested across three separate log plans, Auxiliary, Basic and Analytics, so the plan chosen changes the rate as much as the volume does; Loki the Grafana Cloud free tier caps log ingestion at 50 GB a month with 14 day retention
  • They diverge on capability: Azure Monitor covers Log collection, Loki covers Log aggregation.

Where they differ

Only the attributes on which Azure Monitor and Loki actually diverge.

Attributes where Azure Monitor and Loki differ
AttributeAzure MonitorLoki
Pricing modelusage-basedopen-source
Founded20102014

Identical on both: starting price (Free), free tier (Yes), platforms (Web, Api), user rating (Not yet rated), category (Log Management).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Azure Monitor

  • Log collection
  • Metrics collection
  • Alerts and notifications
  • Custom dashboards

Only in Loki

  • Log aggregation
  • Label-based indexing
  • Real-time log streaming
  • LogQL query language

Both cover

  • API
  • Webhooks
  • REST
  • Web support
  • Api support

What people use each for

The jobs each tool is most often brought in to do.

Azure Monitor

  • Collecting logs and metrics from Azure resourcesnot Loki
  • Alerting on metric thresholds and log queriesnot Loki
  • Application performance monitoring through Application Insightsnot Loki
  • Long-term log retention for compliancenot Loki
  • Querying operational data with KQLnot Loki

Loki

  • Aggregating application and infrastructure logs with label based indexingnot Azure Monitor
  • Querying logs alongside metrics in Grafananot Azure Monitor

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Azure Monitor

  • Billed per GB ingested across three separate log plans, Auxiliary, Basic and Analytics, so the plan chosen changes the rate as much as the volume does
  • Only the first 5 GB a month of Analytics logs is free per billing account
  • Retention beyond the base period is charged per GB per month, up to 2 years interactive and 12 years long term
  • Log queries and search jobs are billed per GB scanned, so investigating an incident costs money
  • Alert rules are billed per time series for metrics and by execution frequency for logs
  • The pricing page shows placeholders rather than rates until a region and currency are chosen

Loki

  • The Grafana Cloud free tier caps log ingestion at 50 GB a month with 14 day retention
  • Paid log pricing is split across three separate meters, at $0.050 per GB processed, $0.400 per GB written and $0.100 per GB retained
  • Retaining logs is billed separately from ingesting them, so keeping data costs on an ongoing basis rather than once
  • The Pro plan carries a $19 a month platform fee before any usage charges

Pricing, plan by plan

Azure Monitor

Free
  • FreeFree
    • Log collection
    • Metrics collection
    • Alerts and notifications

Loki

Free
  • FreeFree
    • Log aggregation
    • Label-based indexing
    • Real-time log streaming

Which should you pick?

Choose Azure Monitor if

  • You need log collection.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want metrics collection.
Azure Monitor review

Choose Loki if

  • You need log aggregation.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want label-based indexing.
Loki review

Questions people ask

Is Azure Monitor or Loki better?
Neither clearly leads. Azure Monitor starts at Free and Loki at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Monitor or Loki?
Azure Monitor starts at Free and Loki at Free.
Does Azure Monitor or Loki run on more platforms?
Both run on Web, Api, so platform support will not decide this one for you.
Can I use Azure Monitor for free?
Both have a free tier, so you can try either at no cost before committing.
What is Azure Monitor best used for?
Azure Monitor is most often used for collecting logs and metrics from azure resources, alerting on metric thresholds and log queries, application performance monitoring through application insights, long-term log retention for compliance. Of those, collecting logs and metrics from azure resources and alerting on metric thresholds and log queries are not what Loki is typically brought in for.
What can Azure Monitor do that Loki cannot?
Azure Monitor covers Log collection, Metrics collection, Alerts and notifications, Custom dashboards. Loki covers Log aggregation, Label-based indexing, Real-time log streaming, LogQL query language. Both handle API, Webhooks, REST, Web support.
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