diff --git a/common/changes/@subsquid/substrate-dump/feat-dump-metrics_2023-09-25-10-56.json b/common/changes/@subsquid/substrate-dump/feat-dump-metrics_2023-09-25-10-56.json
new file mode 100644
index 000000000..64618cc51
--- /dev/null
+++ b/common/changes/@subsquid/substrate-dump/feat-dump-metrics_2023-09-25-10-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@subsquid/substrate-dump",
+      "comment": "feat: implement prometheus metrics",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@subsquid/substrate-dump"
+}
\ No newline at end of file
diff --git a/common/changes/@subsquid/util-internal-archive-layout/feat-dump-metrics_2023-09-25-10-56.json b/common/changes/@subsquid/util-internal-archive-layout/feat-dump-metrics_2023-09-25-10-56.json
new file mode 100644
index 000000000..4c3efa125
--- /dev/null
+++ b/common/changes/@subsquid/util-internal-archive-layout/feat-dump-metrics_2023-09-25-10-56.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@subsquid/util-internal-archive-layout",
+      "comment": "feat: implement onSuccessWrite callback",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@subsquid/util-internal-archive-layout"
+}
\ No newline at end of file
diff --git a/substrate/substrate-dump/src/dumper.ts b/substrate/substrate-dump/src/dumper.ts
index d9afccd04..cbd5a7ea6 100644
--- a/substrate/substrate-dump/src/dumper.ts
+++ b/substrate/substrate-dump/src/dumper.ts
@@ -114,7 +114,7 @@ export class Dumper {
 
         let height = new Throttler(() => this.src().getFinalizedHeight(), 300_000)
         let chainHeight = await height.get()
-        this.prometheus().setLastBlock(this.options.lastBlock ? this.options.lastBlock : chainHeight);
+        this.prometheus().setChainHeight(chainHeight);
 
         let progress = new Progress({
             initialValue: this.range().from,
@@ -211,7 +211,7 @@ export class Dumper {
                 blocks: (nextBlock, prevHash) => this.saveMetadata(this.process(nextBlock, prevHash)),
                 range: this.range(),
                 chunkSize: this.options.chunkSize * 1024 * 1024,
-                onSuccessWrite: (block) => { prometheus.setLastSavedBlock(block); }
+                onSuccessWrite: ({ blockRange: { to } }) => { prometheus.setLastWrittenBlock(to.height); }
             })
         }
     }
diff --git a/substrate/substrate-dump/src/prometheus.ts b/substrate/substrate-dump/src/prometheus.ts
index 6e3e2e750..c2a9c94ae 100644
--- a/substrate/substrate-dump/src/prometheus.ts
+++ b/substrate/substrate-dump/src/prometheus.ts
@@ -5,19 +5,19 @@ import promClient, { collectDefaultMetrics, Gauge, Registry } from 'prom-client'
 export class PrometheusServer {
     private registry = new Registry()
     private port?: number | string
-    private lastBlockGauge: Gauge;
-    private lastSavedBlockGauge: Gauge;
+    private chainHeightGauge: Gauge;
+    private lastWrittenBlockGauge: Gauge;
 
     constructor(port: number) {
         this.port = port;
-        this.lastBlockGauge = new Gauge({
-            name: 'sqd_last_block_total',
+        this.chainHeightGauge = new Gauge({
+            name: 'sqd_dump_chain_height',
             help: 'Last block available in the chain',
             registers: [this.registry]
         });
 
-        this.lastSavedBlockGauge = new Gauge({
-            name: 'sqd_last_saved_block_total',
+        this.lastWrittenBlockGauge = new Gauge({
+            name: 'sqd_dump_last_written_block',
             help: 'Last saved block',
             registers: [this.registry]
         });
@@ -25,12 +25,12 @@ export class PrometheusServer {
         collectDefaultMetrics({register: this.registry})
     }
 
-    setLastBlock(block: number) {
-        this.lastBlockGauge.set(block);
+    setChainHeight(height: number) {
+        this.chainHeightGauge.set(height);
     }
 
-    setLastSavedBlock(block: number) {
-        this.lastSavedBlockGauge.set(block);
+    setLastWrittenBlock(block: number) {
+        this.lastWrittenBlockGauge.set(block);
     }
 
 
diff --git a/util/util-internal-archive-layout/src/layout.ts b/util/util-internal-archive-layout/src/layout.ts
index f58c58dc4..c25475ecf 100644
--- a/util/util-internal-archive-layout/src/layout.ts
+++ b/util/util-internal-archive-layout/src/layout.ts
@@ -173,7 +173,7 @@ export class ArchiveLayout {
             blocks: (nextBlock: number, prevHash?: string) => AsyncIterable<HashAndHeight[]>
             range?: Range
             chunkSize?: number,
-            onSuccessWrite?: (lastBlock: number) => void
+            onSuccessWrite?: (args: { chunk: string, blockRange: { from: HashAndHeight, to: HashAndHeight } }) => void
         }
     ): Promise<void> {
         return this.append(
@@ -186,13 +186,16 @@ export class ArchiveLayout {
                 let out = new GzipBuffer()
 
                 async function save(): Promise<void> {
-                    await getNextChunk(
-                        assertNotNull(firstBlock),
-                        assertNotNull(lastBlock)
-                    ).transactDir('.', async fs => {
+                    const fBlock = assertNotNull(firstBlock);
+                    const lBlock = assertNotNull(firstBlock);
+                    const chunk = getNextChunk(fBlock, lBlock)
+                    chunk.transactDir('.', async fs => {
                         let content = await out.end()
                         const writeResult = fs.write('blocks.jsonl.gz', content)
-                        writeResult.then(() => args.onSuccessWrite ? args.onSuccessWrite(lastBlock?.height || 0) : null)
+                        writeResult.then(() => args.onSuccessWrite ? args.onSuccessWrite({
+                            chunk: chunk.abs(),
+                            blockRange: { from: fBlock, to: lBlock }
+                        }) : null)
                         return writeResult
                     })
                     firstBlock = undefined