fix: Optimize export metric behavior

config/datanode.example.toml

@@ -129,11 +129,10 @@ parallel_scan_channel_size = 32
 # [export_metrics]
 # whether enable export metrics, default is false
 # enable = false
-# The url of metrics export endpoint, default is `frontend` default HTTP endpoint.
-# endpoint = "127.0.0.1:4000"
-# The database name of exported metrics stores, user needs to specify a valid database
-# db = ""
 # The interval of export metrics
 # write_interval = "30s"
+# [export_metrics.remote_write]
+# The url the metrics send to. The url is empty by default, url example: `http://127.0.0.1:4000/v1/prometheus/write?db=information_schema`
+# url = ""
 # HTTP headers of Prometheus remote-write carry
 # headers = {}

config/frontend.example.toml

@@ -87,11 +87,8 @@ tcp_nodelay = true
 # [export_metrics]
 # whether enable export metrics, default is false
 # enable = false
-# The url of metrics export endpoint, default is `frontend` default HTTP endpoint.
-# endpoint = "127.0.0.1:4000"
-# The database name of exported metrics stores, user needs to specify a valid database
-# db = ""
 # The interval of export metrics
 # write_interval = "30s"
-# HTTP headers of Prometheus remote-write carry
-# headers = {}
+# for `frontend`, `self_import` is recommend to collect metrics generated by itself
+# [export_metrics.self_import]
+# db = "information_schema"

config/metasrv.example.toml

@@ -86,11 +86,10 @@ provider = "raft_engine"
 # [export_metrics]
 # whether enable export metrics, default is false
 # enable = false
-# The url of metrics export endpoint, default is `frontend` default HTTP endpoint.
-# endpoint = "127.0.0.1:4000"
-# The database name of exported metrics stores, user needs to specify a valid database
-# db = ""
 # The interval of export metrics
 # write_interval = "30s"
+# [export_metrics.remote_write]
+# The url the metrics send to. The url is empty by default, url example: `http://127.0.0.1:4000/v1/prometheus/write?db=information_schema`
+# url = ""
 # HTTP headers of Prometheus remote-write carry
 # headers = {}

config/standalone.example.toml

@@ -230,11 +230,8 @@ parallel_scan_channel_size = 32
 # [export_metrics]
 # whether enable export metrics, default is false
 # enable = false
-# The url of metrics export endpoint, default is `frontend` default HTTP endpoint.
-# endpoint = "127.0.0.1:4000"
-# The database name of exported metrics stores, user needs to specify a valid database
-# db = ""
 # The interval of export metrics
 # write_interval = "30s"
-# HTTP headers of Prometheus remote-write carry
-# headers = {}
+# for `standalone`, `self_import` is recommend to collect metrics generated by itself
+# [export_metrics.self_import]
+# db = "information_schema"

src/cmd/src/frontend.rs

@@ -252,10 +252,6 @@ impl StartCommand {
         .await
         .context(StartFrontendSnafu)?;
 
-        instance
-            .build_export_metrics_task(&opts.export_metrics)
-            .context(StartFrontendSnafu)?;
-
         instance
             .build_servers(opts)
             .await

src/cmd/src/standalone.rs

@@ -425,10 +425,6 @@ impl StartCommand {
             .await
             .context(StartFrontendSnafu)?;
 
-        frontend
-            .build_export_metrics_task(&opts.frontend.export_metrics)
-            .context(StartFrontendSnafu)?;
-
         frontend
             .build_servers(opts)
             .await

src/datanode/src/datanode.rs

@@ -98,7 +98,7 @@ impl Datanode {
         self.start_telemetry();
 
         if let Some(t) = self.export_metrics_task.as_ref() {
-            t.start()
+            t.start(None).context(StartServerSnafu)?
         }
 
         self.start_services().await

src/frontend/src/instance.rs

@@ -55,7 +55,7 @@ use query::QueryEngineRef;
 use raft_engine::{Config, ReadableSize, RecoveryMode};
 use servers::error as server_error;
 use servers::error::{AuthSnafu, ExecuteQuerySnafu, ParsePromQLSnafu};
-use servers::export_metrics::{ExportMetricsOption, ExportMetricsTask};
+use servers::export_metrics::ExportMetricsTask;
 use servers::interceptor::{
     PromQueryInterceptor, PromQueryInterceptorRef, SqlQueryInterceptor, SqlQueryInterceptorRef,
 };
@@ -76,6 +76,7 @@ use sql::statements::statement::Statement;
 use sqlparser::ast::ObjectName;
 pub use standalone::StandaloneDatanodeManager;
 
+use self::prom_store::ExportMetricHandler;
 use crate::error::{
     self, Error, ExecLogicalPlanSnafu, ExecutePromqlSnafu, ExternalSnafu, ParseSqlSnafu,
     PermissionSnafu, PlanStatementSnafu, Result, SqlExecInterceptedSnafu, StartServerSnafu,
@@ -190,18 +191,16 @@ impl Instance {
         &mut self,
         opts: impl Into<FrontendOptions> + TomlSerializable,
     ) -> Result<()> {
+        let opts: FrontendOptions = opts.into();
+        self.export_metrics_task =
+            ExportMetricsTask::try_new(&opts.export_metrics, Some(&self.plugins))
+                .context(StartServerSnafu)?;
         let servers = Services::build(opts, Arc::new(self.clone()), self.plugins.clone()).await?;
         self.servers = Arc::new(servers);
 
         Ok(())
     }
 
-    pub fn build_export_metrics_task(&mut self, opts: &ExportMetricsOption) -> Result<()> {
-        self.export_metrics_task =
-            ExportMetricsTask::try_new(opts, Some(&self.plugins)).context(StartServerSnafu)?;
-        Ok(())
-    }
-
     pub fn catalog_manager(&self) -> &CatalogManagerRef {
         &self.catalog_manager
     }
@@ -232,7 +231,15 @@ impl FrontendInstance for Instance {
         self.script_executor.start(self)?;
 
         if let Some(t) = self.export_metrics_task.as_ref() {
-            t.start()
+            if t.send_by_handler {
+                let handler = ExportMetricHandler::new_handler(
+                    self.inserter.clone(),
+                    self.statement_executor.clone(),
+                );
+                t.start(Some(handler)).context(StartServerSnafu)?
+            } else {
+                t.start(None).context(StartServerSnafu)?;
+            }
         }
 
         futures::future::try_join_all(self.servers.iter().map(|(name, handler)| async move {

src/frontend/src/instance/prom_store.rs

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use std::sync::Arc;
+
 use api::prom_store::remote::read_request::ResponseType;
 use api::prom_store::remote::{Query, QueryResult, ReadRequest, ReadResponse, WriteRequest};
 use async_trait::async_trait;
@@ -21,10 +23,14 @@ use common_error::ext::BoxedError;
 use common_query::Output;
 use common_recordbatch::RecordBatches;
 use common_telemetry::logging;
+use operator::insert::InserterRef;
+use operator::statement::StatementExecutor;
 use prost::Message;
 use servers::error::{self, AuthSnafu, Result as ServerResult};
 use servers::prom_store::{self, Metrics};
-use servers::query_handler::{PromStoreProtocolHandler, PromStoreResponse};
+use servers::query_handler::{
+    PromStoreProtocolHandler, PromStoreProtocolHandlerRef, PromStoreResponse,
+};
 use session::context::QueryContextRef;
 use snafu::{OptionExt, ResultExt};
 
@@ -209,3 +215,49 @@ impl PromStoreProtocolHandler for Instance {
         todo!();
     }
 }
+
+/// This handler is mainly used for `frontend` or `standalone` to directly import
+/// the metrics collected by itself, thereby avoiding importing metrics through the network,
+/// thus reducing compression and network transmission overhead,
+/// so only implement `PromStoreProtocolHandler::write` method.
+pub struct ExportMetricHandler {
+    inserter: InserterRef,
+    statement_executor: Arc<StatementExecutor>,
+}
+
+impl ExportMetricHandler {
+    pub fn new_handler(
+        inserter: InserterRef,
+        statement_executor: Arc<StatementExecutor>,
+    ) -> PromStoreProtocolHandlerRef {
+        Arc::new(Self {
+            inserter,
+            statement_executor,
+        })
+    }
+}
+
+#[async_trait]
+impl PromStoreProtocolHandler for ExportMetricHandler {
+    async fn write(&self, request: WriteRequest, ctx: QueryContextRef) -> ServerResult<()> {
+        let (requests, _) = prom_store::to_grpc_row_insert_requests(request)?;
+        self.inserter
+            .handle_row_inserts(requests, ctx, self.statement_executor.as_ref())
+            .await
+            .map_err(BoxedError::new)
+            .context(error::ExecuteGrpcQuerySnafu)?;
+        Ok(())
+    }
+
+    async fn read(
+        &self,
+        _request: ReadRequest,
+        _ctx: QueryContextRef,
+    ) -> ServerResult<PromStoreResponse> {
+        unreachable!();
+    }
+
+    async fn ingest_metrics(&self, _metrics: Metrics) -> ServerResult<()> {
+        unreachable!();
+    }
+}

src/meta-srv/src/bootstrap.rs

@@ -94,7 +94,7 @@ impl MetaSrvInstance {
         self.meta_srv.try_start().await?;
 
         if let Some(t) = self.export_metrics_task.as_ref() {
-            t.start()
+            t.start(None).context(InitExportMetricsTaskSnafu)?
         }
 
         let (tx, rx) = mpsc::channel::<()>(1);