feat(pageserver): add PostHog config section

Signed-off-by: Alex Chi Z <chi@neon.tech>

libs/pageserver_api/src/config.rs

@@ -43,6 +43,21 @@ pub struct NodeMetadata {
     pub other: HashMap<String, serde_json::Value>,
 }
 
+/// PostHog integration config
+#[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+pub struct PostHogConfig {
+    /// PostHog project ID
+    project_id: String,
+    /// Server-side (private) API key
+    server_api_key: String,
+    /// Client-side (public) API key
+    client_api_key: String,
+    /// Private API URL
+    private_api_url: String,
+    /// Public API URL
+    public_api_url: String,
+}
+
 /// `pageserver.toml`
 ///
 /// We use serde derive with `#[serde(default)]` to generate a deserializer
@@ -182,6 +197,8 @@ pub struct ConfigToml {
     pub tracing: Option<Tracing>,
     pub enable_tls_page_service_api: bool,
     pub dev_mode: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub posthog_config: Option<PostHogConfig>,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
@@ -659,6 +676,7 @@ impl Default for ConfigToml {
             tracing: None,
             enable_tls_page_service_api: false,
             dev_mode: false,
+            posthog_config: None,
         }
     }
 }

pageserver/src/config.rs

@@ -14,7 +14,7 @@ use std::time::Duration;
 use anyhow::{Context, bail, ensure};
 use camino::{Utf8Path, Utf8PathBuf};
 use once_cell::sync::OnceCell;
-use pageserver_api::config::{DiskUsageEvictionTaskConfig, MaxVectoredReadBytes};
+use pageserver_api::config::{DiskUsageEvictionTaskConfig, MaxVectoredReadBytes, PostHogConfig};
 use pageserver_api::models::ImageCompressionAlgorithm;
 use pageserver_api::shard::TenantShardId;
 use pem::Pem;
@@ -230,6 +230,9 @@ pub struct PageServerConf {
     /// such as authentication requirements for HTTP and PostgreSQL APIs.
     /// This is insecure and should only be used in development environments.
     pub dev_mode: bool,
+
+    /// PostHog integration config
+    pub posthog_config: Option<PostHogConfig>,
 }
 
 /// Token for authentication to safekeepers
@@ -404,6 +407,7 @@ impl PageServerConf {
             tracing,
             enable_tls_page_service_api,
             dev_mode,
+            posthog_config,
         } = config_toml;
 
         let mut conf = PageServerConf {
@@ -513,6 +517,7 @@ impl PageServerConf {
                 }
                 None => Vec::new(),
             },
+            posthog_config,
         };
 
         // ------------------------------------------------------------