Fix permetheus query fingerprinting (#24)

Signed-off-by: eternal-flame-AD <yume@yumechi.jp>

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## Checklist
- [ ] Read the [contribution guide](https://github.com/misskey-dev/misskey/blob/develop/CONTRIBUTING.md)
- [ ] Test working in a local environment
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- [ ] (If needed) Update CHANGELOG.md
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Reviewed-on: #24
Co-authored-by: eternal-flame-AD <yume@yumechi.jp>
Co-committed-by: eternal-flame-AD <yume@yumechi.jp>

packages/backend/src/postgres.ts

@@ -95,7 +95,6 @@ const sqlLogger = dbLogger.createSubLogger('sql', 'gray');
 type QueryTagCache = {
 	join: string;
 	from: string;
-	hash: string;
 };
 
 function dedupConsecutive<T>(arr: T[]): T[] {
@@ -107,40 +106,34 @@ function simplifyIdentifiers(sql: string) {
 }
 
 function extractQueryTags(query: string): QueryTagCache {
-	const joins = query.matchAll(/(LEFT|RIGHT|INNER|OUTER) JOIN ([a-zA-Z0-9_"`.\s]+) ON/ig);
+	const joins = query.matchAll(/(LEFT|RIGHT|INNER|OUTER)[\s\S]+JOIN[\s\r\n]+([a-zA-Z0-9_"`.]+)/ig);
-	const froms = query.matchAll(/FROM ([a-zA-Z0-9_"`.]+)/ig);
+	const froms = query.matchAll(/FROM[\s\r\n]+([a-zA-Z0-9_"`.]+)/ig);
 
 	const join = Array.from(joins).map(j => `${j[1]}:${simplifyIdentifiers(j[2])}`).join('|');
 	const from = dedupConsecutive(Array.from(froms).map(f => simplifyIdentifiers(f[1]))).join('|');
 
-	// this is not for security just to reduce metrics size just for confirmation in local environment
-	// all the code is public there is nothing secret in the query itself
-	const hash = createHash('md5');
-	hash.update(query);
-
 	return {
 		join,
 		from,
-		hash: hash.digest('hex'),
 	};
 }
 
 const mQueryCounter = metricCounter({
 	name: 'misskey_postgres_query_total',
 	help: 'Total queries to postgres',
-	labelNames: ['join', 'from', 'hash'],
+	labelNames: ['join', 'from'],
 });
 
 const mQueryErrorCounter = metricCounter({
 	name: 'misskey_postgres_query_error_total',
 	help: 'Total errors in queries to postgres',
-	labelNames: ['join', 'from', 'hash'],
+	labelNames: ['join', 'from'],
 });
 
 const mSlowQueryHisto = metricHistogram({
 	name: 'misskey_postgres_query_slow_duration_seconds',
 	help: 'Duration of slow queries to postgres',
-	labelNames: ['join', 'from', 'hash'],
+	labelNames: ['join', 'from'],
 	buckets: [0.1, 0.5, 1, 2, 5, 10, 30, 300],
 });