Add exemplars to feature list

README.md

@@ -55,6 +55,7 @@ https://github.com/autometrics-dev/autometrics-rs/assets/3262610/966ed140-1d6c-4
 - [🚨 Define alerts](https://docs.rs/autometrics/latest/autometrics/objectives/index.html) using SLO best practices directly in your source code
 - [📊 Grafana dashboards](https://github.com/autometrics-dev#5-configuring-prometheus) work out of the box to visualize the performance of instrumented functions & SLOs
 - [⚙️ Configurable](https://docs.rs/autometrics/latest/autometrics/#metrics-libraries) metric collection library ([`opentelemetry`](https://crates.io/crates/opentelemetry), [`prometheus`](https://crates.io/crates/prometheus), [`prometheus-client`](https://crates.io/crates/prometheus-client) or [`metrics`](https://crates.io/crates/metrics))
+- [📍 Attach exemplars](https://docs.rs/autometrics/latest/autometrics/exemplars/index.html) to connect metrics with distributed traces
 - ⚡ Minimal runtime overhead
 
 See [Why Autometrics?](https://github.com/autometrics-dev#4-why-autometrics) for more details on the ideas behind autometrics.

autometrics/README.md

@@ -54,6 +54,7 @@ pub async fn main() {
 - [🚨 Define alerts](https://docs.rs/autometrics/latest/autometrics/objectives/index.html) using SLO best practices directly in your source code
 - [📊 Grafana dashboards](https://github.com/autometrics-dev#5-configuring-prometheus) work out of the box to visualize the performance of instrumented functions & SLOs
 - [⚙️ Configurable](#metrics-libraries) metric collection library ([`opentelemetry`](https://crates.io/crates/opentelemetry), [`prometheus`](https://crates.io/crates/prometheus), [`prometheus-client`](https://crates.io/crates/prometheus-client) or [`metrics`](https://crates.io/crates/metrics))
+- [📍 Attach exemplars](https://docs.rs/autometrics/latest/autometrics/exemplars/index.html) to connect metrics with distributed traces
 - ⚡ Minimal runtime overhead
 
 See [Why Autometrics?](https://github.com/autometrics-dev#4-why-autometrics) for more details on the ideas behind autometrics.
@@ -110,7 +111,7 @@ fn main() {
 ### Feature flags
 
 - `prometheus-exporter` - exports a Prometheus metrics collector and exporter (compatible with any of the Metrics Libraries)
-- `exemplars-tracing` - extract fields from [`tracing::Span`](https://docs.rs/tracing/latest/tracing/struct.Span.html)s and attach them as [exemplars](https://grafana.com/docs/grafana/latest/fundamentals/exemplars/) for the metrics produced by Autometrics. This is currently only supported with the `prometheus-client` feature, because only that crate has support for exemplars. Note that Prometheus must be specifically [configured](https://prometheus.io/docs/prometheus/latest/feature_flags/#exemplars-storage) to enable the exemplars feature.
+- `exemplars-tracing` - extract fields from [`tracing::Span`](https://docs.rs/tracing/latest/tracing/struct.Span.html)s and attach them as [exemplars](https://grafana.com/docs/grafana/latest/fundamentals/exemplars/) for the metrics produced by Autometrics. This is currently only supported with the `prometheus-client` feature due to lack of support in the other metrics libraries. Note that Prometheus must be specifically [configured](https://prometheus.io/docs/prometheus/latest/feature_flags/#exemplars-storage) to enable the exemplars feature.
 - `custom-objective-latency` - by default, Autometrics only supports a fixed set of latency thresholds for objectives. Enable this to use custom latency thresholds. Note, however, that the custom latency **must** match one of the buckets configured for your histogram or the alerts will not work. This is not currently compatible with the `prometheus` or `prometheus-exporter` feature.
 - `custom-objective-percentile` by default, Autometrics only supports a fixed set of objective percentiles. Enable this to use a custom percentile. Note, however, that using custom percentiles requires generating a different recording and alerting rules file using the CLI + Sloth (see [here](https://github.com/autometrics-dev/autometrics-rs/tree/main/autometrics-cli)).