add info.json with start time (#2610)

profiling/Cargo.toml

@@ -19,6 +19,7 @@ anyhow = { version = "1.0" }
 bumpalo = { version = "3.12", features = ["collections"] }
 cfg-if = { version = "1.0" }
 cpu-time = { version = "1.0" }
+chrono = { version = "0.4" }
 crossbeam-channel = { version = "0.5", default-features = false, features = ["std"] }
 datadog-profiling = { git = "https://github.com/DataDog/libdatadog", tag = "v7.0.0" }
 ddcommon = { git = "https://github.com/DataDog/libdatadog", tag = "v7.0.0" }

profiling/src/profiling/mod.rs

@@ -17,6 +17,7 @@ use crate::bindings::ddog_php_prof_get_active_fiber_test as ddog_php_prof_get_ac
 use crate::bindings::{datadog_php_profiling_get_profiling_context, zend_execute_data};
 use crate::config::SystemSettings;
 use crate::{CLOCKS, TAGS};
+use chrono::Utc;
 use core::{ptr, str};
 use crossbeam_channel::{Receiver, Sender, TrySendError};
 use datadog_profiling::api::{
@@ -527,6 +528,7 @@ impl Profiler {
             upload_receiver,
             system_settings.output_pprof.clone(),
             system_settings.uri.clone(),
+            Utc::now(),
         );
 
         let ddprof_time = "ddprof_time";

profiling/src/profiling/uploader.rs

@@ -3,6 +3,7 @@ use crate::config::AgentEndpoint;
 use crate::exception::EXCEPTION_PROFILING_EXCEPTION_COUNT;
 use crate::profiling::{UploadMessage, UploadRequest};
 use crate::{PROFILER_NAME_STR, PROFILER_VERSION_STR};
+use chrono::{DateTime, Utc};
 use crossbeam_channel::{select, Receiver};
 use datadog_profiling::exporter::File;
 use ddcommon::Endpoint;
@@ -19,6 +20,7 @@ pub struct Uploader {
     receiver: Receiver<UploadMessage>,
     output_pprof: Option<Cow<'static, str>>,
     endpoint: AgentEndpoint,
+    start_time: String,
 }
 
 impl Uploader {
@@ -27,12 +29,14 @@ impl Uploader {
         receiver: Receiver<UploadMessage>,
         output_pprof: Option<Cow<'static, str>>,
         endpoint: AgentEndpoint,
+        start_time: DateTime<Utc>,
     ) -> Self {
         Self {
             fork_barrier,
             receiver,
             output_pprof,
             endpoint,
+            start_time: start_time.to_rfc3339_opts(chrono::SecondsFormat::Secs, true),
         }
     }
 
@@ -47,6 +51,15 @@ impl Uploader {
         Some(metadata)
     }
 
+    fn create_profiler_info(&self) -> Option<serde_json::Value> {
+        let metadata = json!({
+            "application": {
+                "start_time": self.start_time,
+            }
+        });
+        Some(metadata)
+    }
+
     fn upload(&self, message: Box<UploadRequest>) -> anyhow::Result<u16> {
         let index = message.index;
         let profile = message.profile;
@@ -84,7 +97,7 @@ impl Uploader {
             None,
             endpoint_counts,
             Self::create_internal_metadata(),
-            None,
+            self.create_profiler_info(),
             timeout,
         )?;
         debug!("Sending profile to: {agent_endpoint}");