# Logs

> Everything you need to know to start exploring Logs with Last9.

Source: https://last9.io/docs/logs/

## Sending Logs to Last9

You can send a variety of logs to Last9 from different sources:

- [Using OpenTelemetry](/docs/integrations/observability/opentelemetry/)
- and, [other integrations](/docs/integrations/)

You can also view the list of integrations in the Last9 app as well under the [Logs category on the Integrations screen](https://app.last9.io/integrations?category=logs).

## Exploring Logs

There are 3 primary ways of exploring Logs depending on specific use cases.

- **Logs Explorer:** Use Last9's native UI for logs with first-class search and filters in the Builder mode or the LogQL-compatible Editor mode for advanced queries. Quickly view related logs, traces, and metrics by clicking on any log line. [Learn more](/docs/logs-explorer/).
- **Grafana Loki:** For people who are familiar with Loki, use Last9's embedded instance of Grafana. [Learn more](/docs/grafana-loki-in-last9/).
- **SQL Exploration:** Last9 also allows exploring raw logs data using Clickhouse SQL. This is useful for adhoc exploration of Logs for deeper analysis. Contact Last9 team to provision a custom SQL data source for you.

## Alerting on Logs

To create alerts based on log data, use [Scheduled Search](/docs/scheduled-search/). Scheduled Search allows you to run periodic LogQL queries and receive notifications when patterns are found or missing.

:::tip[Log Alerts vs Metrics Alerts]
**Scheduled Search** is for log-based alerts using LogQL. For metrics-based alerts using PromQL, use [Alerting](/docs/alerting/) instead.
:::

Common use cases for log-based alerts:

- Alert when error rates exceed a threshold
- Detect missing scheduled jobs (backups, cron tasks)
- Monitor for security events (failed logins, suspicious activity)
- Track application-specific events and patterns

[Learn more about Scheduled Search →](/docs/scheduled-search/)

## Accelerated Queries

Last9 accelerates queries when a query is made on following attributes.

- Service
- Severity

For this reason, users are encouraged to filter by `Service` or `Severity` first when searching for long time ranges.

:::tip
The Logs Explorer and Loki interface shows only `Service`, `Severity` and `Body` attributes as first filters by default for time ranges greater than 15 minutes.
:::

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## Troubleshooting

Please get in touch with us on [Discord](https://discord.com/invite/Q3p2EEucx9) or [Email](mailto:support@last9.io) if you have any questions.