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+---
+title: UTF-8 in Prometheus
+---
+
+# Introduction
+
+Versions of Prometheus before 3.0 required that metric and label names adhere to
+a strict set of character requirements. With Prometheus 3.0, all UTF-8 strings
+are valid names, but there are some manual changes needed for other parts of the ecosystem to introduce names with any UTF-8 characters.
+
+There may also be circumstances where users want to enforce the legacy character
+set, perhaps for compatibility with an older system or one that does not yet
+support UTF-8.
+
+This document guides you through the UTF-8 transition details.
+
+# Go Instrumentation 
+
+Currently, metrics created by the official Prometheus [client_golang library](github.com/prometheus/client_golang) will reject UTF-8 names
+by default. It is necessary to change the default validation scheme to allow
+UTF-8. The requirement to set this value will be removed in a future version of
+the common library.
+
+```golang
+import "github.com/prometheus/common/model"
+
+func init() {
+	model.NameValidationScheme = model.UTF8Validation
+}
+```
+
+If users want to enforce the legacy character set, they can set the validation
+scheme to `LegacyValidation`.
+
+Setting the validation scheme must be done before the instantiation of metrics
+and can be set on the fly if desired.
+
+## Instrumenting in other languages
+
+Other client libraries may have similar requirements to set the validation
+scheme. Check the documentation for the library you are using.
+
+# Configuring Name Validation during Scraping
+
+By default, Prometheus 3.0 accepts all UTF-8 strings as valid metric and label
+names. It is possible to override this behavior for scraped targets and reject
+names that do not conform to the legacy character set.
+
+This option can be set in the Prometheus YAML file on a global basis:
+
+```yaml
+global:
+  metric_name_validation_scheme: legacy
+```
+
+or on a per-scrape config basis:
+
+```yaml
+scrape_configs:
+  - job_name: prometheus
+    metric_name_validation_scheme: legacy
+```
+
+Scrape config settings override the global setting.
+
+## Scrape Content Negotiation for UTF-8 escaping
+
+At scrape time, the scraping system **must** pass `escaping=allow-utf-8` in the
+Accept header in order to be served UTF-8 names. If a system being scraped does
+not see this header, it will automatically convert UTF-8 names to
+legacy-compatible using underscore replacement.
+
+Scraping systems can also request a specfic escaping method if desired by
+setting the `escaping` header to a different value.
+
+* `underscores`: The default: convert legacy-invalid characters to underscores.
+* `dots`: similar to UnderscoreEscaping, except that dots are converted to
+  `_dot_` and pre-existing underscores are converted to `__`. This allows for
+  round-tripping of simple metric names that also contain dots.
+* `values`: This mode prepends the name with `U__` and replaces all invalid
+  characters with the unicode value, surrounded by underscores. Single
+  underscores are replaced with double underscores. This mode allows for full
+  round-tripping of UTF-8 names with a legacy system.
+
+## Remote Write 2.0
+
+Remote Write 2.0 automatically accepts all UTF-8 names in Prometheus 3.0. There
+is no way to enforce the legacy character set validation with Remote Write 2.0.
+
+# OTLP Metrics
+
+OTLP receiver in Prometheus 3.0 still normalizes all names to Prometheus format by default. You can change this in `otlp` section of the Prometheus configuration as follows:
+
+
+    otlp:
+      # Ingest OTLP data keeping UTF-8 characters in metric/label names.
+      translation_strategy: NoUTF8EscapingWithSuffixes
+
+
+See [OpenTelemetry guide](./opentelemetry) for more details.
+
+
+# Querying
+
+
+Querying for metrics with UTF-8 names will require a slightly different syntax
+in PromQL.
+
+The classic query syntax will still work for legacy-compatible names:
+
+`my_metric{}`
+
+But UTF-8 names must be quoted **and** moved into the braces:
+
+`{"my.metric"}`
+
+Label names must also be quoted if they contain legacy-incompatible characters:
+
+`{"metric.name", "my.label.name"="bar"}`
+
+The metric name can appear anywhere inside the braces, but style prefers that it
+be the first term.
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