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Add prometheus remote write serializer (#8360)
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| # Prometheus | ||
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| The `prometheusremotewrite` data format converts metrics into the Prometheus protobuf | ||
| exposition format. | ||
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| **Warning**: When generating histogram and summary types, output may | ||
| not be correct if the metric spans multiple batches. This issue can be | ||
| somewhat, but not fully, mitigated by using outputs that support writing in | ||
| "batch format". When using histogram and summary types, it is recommended to | ||
| use only the `prometheus_client` output. | ||
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| ### Configuration | ||
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| ```toml | ||
| [[outputs.http]] | ||
| url = "https://cortex/api/prom/push" | ||
| data_format = "prometheusremotewrite" | ||
| tls_ca = "/etc/telegraf/ca.pem" | ||
| tls_cert = "/etc/telegraf/cert.pem" | ||
| tls_key = "/etc/telegraf/key.pem" | ||
| [outputs.http.headers] | ||
| Content-Type = "application/x-protobuf" | ||
| Content-Encoding = "snappy" | ||
| X-Prometheus-Remote-Write-Version = "0.1.0" | ||
| ``` | ||
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| ### Metrics | ||
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| A Prometheus metric is created for each integer, float, boolean or unsigned | ||
| field. Boolean values are converted to *1.0* for true and *0.0* for false. | ||
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| The Prometheus metric names are produced by joining the measurement name with | ||
| the field key. In the special case where the measurement name is `prometheus` | ||
| it is not included in the final metric name. | ||
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| Prometheus labels are produced for each tag. | ||
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| **Note:** String fields are ignored and do not produce Prometheus metrics. |
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