From 4847efdfe5cc163c19a1ed93ac624634b2c0ac72 Mon Sep 17 00:00:00 2001
From: Matt Johnston <matt.johnston@supabase.io>
Date: Tue, 3 Nov 2026 06:31:43 -0400
Subject: [PATCH] feat: add --enable-otel-metrics to export OpenTelemetry
 metrics from the workers

---
 cli/src/flags.rs          | 5 +++++
 cli/src/main.rs           | 6 ++++++
 crates/base/src/server.rs | 3 +++
 3 files changed, 14 insertions(+)

diff --git a/cli/src/flags.rs b/cli/src/flags.rs
index 136b3e0a9..393922835 100644
--- a/cli/src/flags.rs
+++ b/cli/src/flags.rs
@@ -329,6 +329,11 @@ fn get_start_command() -> Command {
         .default_missing_value("main,event")
         .action(ArgAction::Append),
     )
+    .arg(
+      arg!(--"enable-otel-metrics")
+        .help("Also export OpenTelemetry metrics from the workers --enable-otel instruments")
+        .action(ArgAction::SetTrue),
+    )
     .arg(
       arg!(--"otel-console" <MODE>)
         // .env("OTEL_DENO_CONSOLE")
diff --git a/cli/src/main.rs b/cli/src/main.rs
index 939dc6b5f..d561cd0d7 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -141,6 +141,11 @@ fn main() -> Result<ExitCode, anyhow::Error> {
           .cloned()
           .collect::<Vec<_>>();
 
+        let otel_metrics = sub_matches
+          .get_one::<bool>("enable-otel-metrics")
+          .cloned()
+          .unwrap_or_default();
+
         let otel_console = sub_matches
           .get_one::<OtelConsoleConfig>("otel-console")
           .cloned()
@@ -251,6 +256,7 @@ fn main() -> Result<ExitCode, anyhow::Error> {
           } else {
             None
           },
+          otel_metrics,
           otel_console,
 
           no_module_cache,
diff --git a/crates/base/src/server.rs b/crates/base/src/server.rs
index 0b33426d7..e9d50e305 100644
--- a/crates/base/src/server.rs
+++ b/crates/base/src/server.rs
@@ -328,6 +328,7 @@ impl RequestIdleTimeout {
 #[derive(Debug, Default, Clone, Copy)]
 pub struct ServerFlags {
   pub otel: Option<OtelKind>,
+  pub otel_metrics: bool,
   pub otel_console: Option<OtelConsoleConfig>,
 
   pub no_module_cache: bool,
@@ -467,6 +468,7 @@ impl Server {
       if let Some(OtelKind::Event | OtelKind::Both) = flags.otel {
         builder.set_otel_config(Some(OtelConfig {
           tracing_enabled: true,
+          metrics_enabled: flags.otel_metrics,
           console: flags.otel_console.unwrap_or_default(),
           propagators: HashSet::from([
             OtelPropagators::TraceContext,
@@ -522,6 +524,7 @@ impl Server {
       if let Some(OtelKind::Main | OtelKind::Both) = flags.otel {
         builder.set_otel_config(Some(OtelConfig {
           tracing_enabled: true,
+          metrics_enabled: flags.otel_metrics,
           console: flags.otel_console.unwrap_or_default(),
           propagators: HashSet::from([
             OtelPropagators::TraceContext,