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161 lines
5.9 KiB
Markdown
161 lines
5.9 KiB
Markdown
---
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slug: /en/interfaces/prometheus
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sidebar_position: 19
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sidebar_label: Prometheus protocols
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---
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# Prometheus protocols
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## Exposing metrics {#expose}
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:::note
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ClickHouse Cloud does not currently support connecting to Prometheus. To be notified when this feature is supported, please contact support@clickhouse.com.
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:::
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ClickHouse can expose its own metrics for scraping from Prometheus:
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```xml
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<prometheus>
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<port>9363</port>
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<endpoint>/metrics</endpoint>
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<metrics>true</metrics>
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<asynchronous_metrics>true</asynchronous_metrics>
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<events>true</events>
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<errors>true</errors>
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</prometheus>
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Section `<prometheus.handlers>` can be used to make more extended handlers.
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This section is similar to [<http_handlers>](/en/interfaces/http) but works for prometheus protocols:
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```xml
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<prometheus>
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<port>9363</port>
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<handlers>
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<my_rule_1>
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<url>/metrics</url>
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<handler>
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<type>expose_metrics</type>
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<metrics>true</metrics>
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<asynchronous_metrics>true</asynchronous_metrics>
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<events>true</events>
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<errors>true</errors>
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</handler>
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</my_rule_1>
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</handlers>
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</prometheus>
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```
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Settings:
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| Name | Default | Description |
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|---|---|---|---|
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| `port` | none | Port for serving the exposing metrics protocol. |
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| `endpoint` | `/metrics` | HTTP endpoint for scraping metrics by prometheus server. Starts with `/`. Should not be used with the `<handlers>` section. |
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| `url` / `headers` / `method` | none | Filters used to find a matching handler for a request. Similar to the fields with the same names in the [<http_handlers>](/en/interfaces/http) section. |
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| `metrics` | true | Expose metrics from the [system.metrics](/en/operations/system-tables/metrics) table. |
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| `asynchronous_metrics` | true | Expose current metrics values from the [system.asynchronous_metrics](/en/operations/system-tables/asynchronous_metrics) table. |
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| `events` | true | Expose metrics from the [system.events](/en/operations/system-tables/events) table. |
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| `errors` | true | Expose the number of errors by error codes occurred since the last server restart. This information could be obtained from the [system.errors](/en/operations/system-tables/errors) as well. |
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Check (replace `127.0.0.1` with the IP addr or hostname of your ClickHouse server):
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```bash
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curl 127.0.0.1:9363/metrics
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```
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## Remote-write protocol {#remote-write}
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ClickHouse supports the [remote-write](https://prometheus.io/docs/specs/remote_write_spec/) protocol.
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Data are received by this protocol and written to a [TimeSeries](/en/engines/table-engines/special/time_series) table
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(which should be created beforehand).
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```xml
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<prometheus>
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<port>9363</port>
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<handlers>
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<my_rule_1>
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<url>/write</url>
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<handler>
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<type>remote_write</type>
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<database>db_name</database>
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<table>time_series_table</table>
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</handler>
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</my_rule_1>
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</handlers>
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</prometheus>
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```
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Settings:
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| Name | Default | Description |
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|---|---|---|---|
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| `port` | none | Port for serving the `remote-write` protocol. |
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| `url` / `headers` / `method` | none | Filters used to find a matching handler for a request. Similar to the fields with the same names in the [<http_handlers>](/en/interfaces/http) section. |
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| `table` | none | The name of a [TimeSeries](/en/engines/table-engines/special/time_series) table to write data received by the `remote-write` protocol. This name can optionally contain the name of a database too. |
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| `database` | none | The name of a database where the table specified in the `table` setting is located if it's not specified in the `table` setting. |
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## Remote-read protocol {#remote-read}
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ClickHouse supports the [remote-read](https://prometheus.io/docs/prometheus/latest/querying/remote_read_api/) protocol.
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Data are read from a [TimeSeries](/en/engines/table-engines/special/time_series) table and sent via this protocol.
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```xml
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<prometheus>
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<port>9363</port>
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<handlers>
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<my_rule_1>
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<url>/read</url>
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<handler>
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<type>remote_read</type>
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<database>db_name</database>
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<table>time_series_table</table>
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</handler>
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</my_rule_1>
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</handlers>
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</prometheus>
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```
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Settings:
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| Name | Default | Description |
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|---|---|---|---|
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| `port` | none | Port for serving the `remote-read` protocol. |
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| `url` / `headers` / `method` | none | Filters used to find a matching handler for a request. Similar to the fields with the same names in the [<http_handlers>](/en/interfaces/http) section. |
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| `table` | none | The name of a [TimeSeries](/en/engines/table-engines/special/time_series) table to read data to send by the `remote-read` protocol. This name can optionally contain the name of a database too. |
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| `database` | none | The name of a database where the table specified in the `table` setting is located if it's not specified in the `table` setting. |
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## Configuration for multiple protocols {#multiple-protocols}
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Multiple protocols can be specified together in one place:
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```xml
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<prometheus>
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<port>9363</port>
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<handlers>
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<my_rule_1>
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<url>/metrics</url>
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<handler>
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<type>expose_metrics</type>
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<metrics>true</metrics>
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<asynchronous_metrics>true</asynchronous_metrics>
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<events>true</events>
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<errors>true</errors>
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</handler>
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</my_rule_1>
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<my_rule_2>
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<url>/write</url>
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<handler>
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<type>remote_write</type>
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<table>db_name.time_series_table</table>
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</handler>
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</my_rule_2>
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<my_rule_3>
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<url>/read</url>
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<handler>
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<type>remote_read</type>
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<table>db_name.time_series_table</table>
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</handler>
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</my_rule_3>
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</handlers>
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</prometheus>
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```
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