store: Tag FilterQuery with GCP conforming info

Author: lutter

store/postgres/src/relational.rs

@@ -673,6 +673,7 @@ impl Layout {
             range,
             block,
             query_id,
+            &self.site,
         )?;
         let query_clone = query.clone();
 

store/postgres/src/relational_queries.rs

@@ -41,7 +41,7 @@ use crate::{
         BlockRangeColumn, BlockRangeLowerBoundClause, BlockRangeUpperBoundClause, BLOCK_COLUMN,
         BLOCK_RANGE_COLUMN, BLOCK_RANGE_CURRENT,
     },
-    primary::Namespace,
+    primary::{Namespace, Site},
 };
 
 /// Those are columns that we always want to fetch from the database.
@@ -2826,6 +2826,7 @@ pub struct FilterQuery<'a> {
     range: FilterRange,
     block: BlockNumber,
     query_id: Option<String>,
+    site: &'a Site,
 }
 
 /// String representation that is useful for debugging when `walk_ast` fails
@@ -2851,6 +2852,7 @@ impl<'a> FilterQuery<'a> {
         range: EntityRange,
         block: BlockNumber,
         query_id: Option<String>,
+        site: &'a Site,
     ) -> Result<Self, QueryExecutionError> {
         let sort_key = SortKey::new(order, collection, filter, block)?;
 
@@ -2860,6 +2862,7 @@ impl<'a> FilterQuery<'a> {
             range: FilterRange(range),
             block,
             query_id,
+            site,
         })
     }
 
@@ -3120,10 +3123,17 @@ impl<'a> QueryFragment<Pg> for FilterQuery<'a> {
             return Ok(());
         }
 
+        // Tag the query with various information to make connecting it to
+        // the GraphQL query it came from easier. The names of the tags are
+        // chosen so that GCP's Query Insights will recognize them
         if let Some(qid) = &self.query_id {
-            out.push_sql("/* qid: ");
+            out.push_sql("/* controller='filter',application='");
+            out.push_sql(self.site.namespace.as_str());
+            out.push_sql("',route='");
             out.push_sql(qid);
-            out.push_sql(" */\n");
+            out.push_sql("',action='");
+            out.push_sql(&self.block.to_string());
+            out.push_sql("' */\n");
         }
         // We generate four different kinds of queries, depending on whether
         // we need to window and whether we query just one or multiple entity