feat(schema): Add Getter for fields commonly used in tags (#2707)

Sentry extracts the `logger` and `level` fields into tags, and both of
these fields are commonly used in dashboard widgets. For this reason,
on-demand metric extraction needs access to those fields.

Sentry will convert queries for the tags into the corresponding fields,
as the tag does not exist in Relay yet.

Author: jan-auer

CHANGELOG.md

@@ -9,7 +9,7 @@
 - Group resource spans by scrubbed domain and filename. ([#2654](https://github.com/getsentry/relay/pull/2654))
 - Convert transactions to spans for all organizations. ([#2659](https://github.com/getsentry/relay/pull/2659))
 - Filter outliers (>180s) for mobile measurements. ([#2649](https://github.com/getsentry/relay/pull/2649))
-- Allow access to more context fields in dynamic sampling and metric extraction. ([#2607](https://github.com/getsentry/relay/pull/2607), [#2640](https://github.com/getsentry/relay/pull/2640), [#2675](https://github.com/getsentry/relay/pull/2675))
+- Allow access to more context fields in dynamic sampling and metric extraction. ([#2607](https://github.com/getsentry/relay/pull/2607), [#2640](https://github.com/getsentry/relay/pull/2640), [#2675](https://github.com/getsentry/relay/pull/2675), [#2707](https://github.com/getsentry/relay/pull/2707))
 - Allow advanced scrubbing expressions for datascrubbing safe fields. ([#2670](https://github.com/getsentry/relay/pull/2670))
 - Disable graphql scrubbing when datascrubbing is disabled. ([#2689](https://github.com/getsentry/relay/pull/2689))
 - Track when a span was received. ([#2688](https://github.com/getsentry/relay/pull/2688))

relay-event-schema/src/protocol/event.rs

@@ -626,10 +626,12 @@ impl Getter for Event {
     fn get_value(&self, path: &str) -> Option<Val<'_>> {
         Some(match path.strip_prefix("event.")? {
             // Simple fields
+            "level" => self.level.value()?.name().into(),
             "release" => self.release.as_str()?.into(),
             "dist" => self.dist.as_str()?.into(),
             "environment" => self.environment.as_str()?.into(),
             "transaction" => self.transaction.as_str()?.into(),
+            "logger" => self.logger.as_str()?.into(),
             "platform" => self.platform.as_str().unwrap_or("other").into(),
 
             // Fields in top level structures (called "interfaces" in Sentry)

relay-event-schema/src/protocol/types.rs

@@ -659,6 +659,16 @@ pub enum Level {
 }
 
 impl Level {
+    pub fn name(self) -> &'static str {
+        match self {
+            Level::Debug => "debug",
+            Level::Info => "info",
+            Level::Warning => "warning",
+            Level::Error => "error",
+            Level::Fatal => "fatal",
+        }
+    }
+
     fn from_python_level(value: u64) -> Option<Level> {
         Some(match value {
             10 => Level::Debug,
@@ -688,13 +698,7 @@ impl FromStr for Level {
 
 impl fmt::Display for Level {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            Level::Debug => write!(f, "debug"),
-            Level::Info => write!(f, "info"),
-            Level::Warning => write!(f, "warning"),
-            Level::Error => write!(f, "error"),
-            Level::Fatal => write!(f, "fatal"),
-        }
+        f.write_str(self.name())
     }
 }