Add Metrics

These metrics were used by our current metrics and alerting system to determine whether or not the poster is running successfully. We add these back so we can use similar metrics.

poster/src/index.ts

@@ -64,12 +64,37 @@ async function run() {
     web3.eth.transactionConfirmationBlocks = 10;
   }
 
-  try {
-    await main(sources, poster_key, view_address, view_function, gas_limit, gas_price, price_delta, assets, mocked_world, pairs, web3);
-    console.log('Poster run completed successfully');
-  } catch (e) {
-    console.error(`Poster failed to run`, e);
-  }
+  await main(sources, poster_key, view_address, view_function, gas_limit, gas_price, price_delta, assets, mocked_world, pairs, web3);
+
+  let success_log = {
+    message: "Price Feed Poster run completed successfully",
+    metric_name: 'PriceFeed-PosterHealth',
+    labels: {
+      price_feed_poster_healthy: 1
+    }
+  };
+
+  process.stderr.write(JSON.stringify(success_log) + "\n", () => {
+    process.exit(0);
+  });
 }
 
-run();
+run().catch((e) => {
+  console.error(`Error encountered: ${e}`);
+  console.error(e);
+  console.log(e.stack)
+  console.log
+
+  let error_log = {
+    message: "Price run failed",
+    metric_name: 'PriceFeed-PosterHealth',
+    labels: {
+      price_feed_poster_healthy: 0,
+      error: e.toString()
+    }
+  };
+
+  process.stderr.write(JSON.stringify(error_log) + "\n", () => {
+    process.exit(1);
+  })
+});