Initial commit: LangChain evolution tutorial deck (132 slides)

- Cover, TOC, 5 dividers, 3 recap slides - 5 sections (chains, langgraph, deepagents, openswe, ecosystem) - design-system.js with theme tokens + 9 helper functions - research/: timeline + sources + per-tech notes - final-compile.js + merge.js for rebuild pipeline - output/: langchain-evolution.pptx (2.3 MB) + langchain-evolution.pdf (1.1 MB) + 7 sample previews
2026-06-22 11:29:03 +03:00
parent ed5b5c91bf
commit 75601988c2
220 changed files with 13069 additions and 3 deletions
@@ -0,0 +1,74 @@
+/**
+ * slides/20-observability.js
+ * ----------------------------------------------------------------------------
+ * Slide 20 -- Observability: Datadog + LangSmith
+ * Tracing + metrics.
+ */
+'use strict';
+
+const { helpers, layouts } = require('../../design-system');
+
+function buildObservability(pres, theme) {
+  const slide = pres.addSlide();
+  helpers.slideBase(slide, pres, theme);
+  helpers.addHeader(slide, pres, theme, {
+    eyebrow: 'STAGE 4',
+    sectionNumber: 4,
+    title: 'Observability',
+  });
+
+  helpers.addCodeBlock(slide, pres, theme, {
+    x: 0.5, y: layouts.CONTENT_TOP, w: 5.6, h: 3.5,
+    language: 'python',
+    code: [
+      '# observability.py',
+      'from datadog import statsd',
+      'from langchain_core.tracers import (',
+      '    LangChainTracer,',
+      ')',
+      '',
+      'tracer = LangChainTracer(',
+      '    project_name="open-swe-prod",',
+      ')',
+      '',
+      'def record_step(thread_id, duration_s):',
+      '    statsd.histogram(',
+      '        "open_swe.step.duration_s",',
+      '        duration_s, tags=[f"t:{thread_id}"],',
+      '    )',
+    ].join('\n'),
+    filePath: 'open_swe/observability.py',
+    startLine: 1,
+    highlightLines: [3, 4, 5, 8, 9, 10],
+  });
+
+  helpers.addCallout(slide, pres, theme, {
+    x: 6.3, y: layouts.CONTENT_TOP, w: 3.2, h: 1.7,
+    kind: 'info',
+    title: 'LangSmith',
+    text:
+      'Trace каждого run: model ' +
+      'calls, tool calls, retries. ' +
+      'Replay, debug, manual ' +
+      'evaluation.',
+  });
+
+  helpers.addCallout(slide, pres, theme, {
+    x: 6.3, y: 3.05, w: 3.2, h: 1.8,
+    kind: 'success',
+    title: 'Datadog',
+    text:
+      'P95 latency, tokens per ' +
+      'run, error rate, sandbox ' +
+      'spend. Alerts на cost ' +
+      'spikes и длинные loops.',
+  });
+
+  helpers.addPageNumber(slide, pres, theme, 20);
+  helpers.addSourceLine(slide, pres, theme, {
+    source: 'research/per-tech/openswe.md + Datadog / LangSmith docs',
+  });
+  return slide;
+}
+
+module.exports = { buildObservability };