Restore original dates on the two refreshed agent blog posts

[jannikmaierhoefer]

What

Reverts the frontmatter date fields that the content refreshes in #3305 bumped to July 2026, restoring the pre-refresh values:

• content/blog/2025-03-19-ai-agent-comparison.mdx: 2026/07/13 → 2025/03/19
• content/blog/2024-07-ai-agent-observability-with-langfuse.mdx: 2026/07/15 → 2025/03/16

Content is unchanged — dates only. Both values match each post's frontmatter as of the commit before #3305 (6c47aa3).

🤖 Generated with Claude Code

https://claude.ai/code/session_01T9eeJ64aD7eTMQmsSBUhYJ

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Generated by Claude Code

Greptile Summary

This PR reverts the date frontmatter field in two blog post MDX files that were accidentally bumped to July 2026 by a content-refresh PR (#3305), restoring the original 2025 publication dates.

• 2024-07-ai-agent-observability-with-langfuse.mdx: date reverted from 2026/07/15 → 2025/03/16
• 2025-03-19-ai-agent-comparison.mdx: date reverted from 2026/07/13 → 2025/03/19

Confidence Score: 5/5

Safe to merge — the change is two one-line frontmatter date corrections with no content modifications.

Both changes are single-field frontmatter reversions that restore the originally intended publication dates. No logic, content, or configuration is touched.

No files require special attention.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant PR3305 as PR #3305 (content refresh)
    participant Frontmatter as Blog Frontmatter
    participant PR3306 as PR #3306 (this PR)

    PR3305->>Frontmatter: Set date to 2026/07/15 (agent-observability)
    PR3305->>Frontmatter: Set date to 2026/07/13 (agent-comparison)
    PR3306->>Frontmatter: Revert date to 2025/03/16 (agent-observability)
    PR3306->>Frontmatter: Revert date to 2025/03/19 (agent-comparison)

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sequenceDiagram
    participant PR3305 as PR #3305 (content refresh)
    participant Frontmatter as Blog Frontmatter
    participant PR3306 as PR #3306 (this PR)

    PR3305->>Frontmatter: Set date to 2026/07/15 (agent-observability)
    PR3305->>Frontmatter: Set date to 2026/07/13 (agent-comparison)
    PR3306->>Frontmatter: Revert date to 2025/03/16 (agent-observability)
    PR3306->>Frontmatter: Revert date to 2025/03/19 (agent-comparison)

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_{Reviews (1): Last reviewed commit: "Restore original frontmatter dates on tw..." | Re-trigger Greptile}

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Project	Deployment	Actions	Updated (UTC)
langfuse-docs	Ready	Preview, Comment	Jul 15, 2026 4:38pm

[github-actions]

@claude review

[claude]

LGTM — straightforward frontmatter date revert.

What was reviewed: Both frontmatter date fields against the pre-#3305 commit; the BlogHeader date prop mismatch flagged by the bug hunter is a pre-existing pattern (confirmed by checking blog history prior to #3305) and unrelated to this change.

Extended reasoning...

Overview

This PR reverts the frontmatter date field in two blog MDX files (content/blog/2024-07-ai-agent-observability-with-langfuse.mdx and content/blog/2025-03-19-ai-agent-comparison.mdx) back to their pre-#3305 values (2025/03/16 and 2025/03/19 respectively). No other content changed.

Security risks

None. This is a documentation date field change with no code, config, or logic impact.

Level of scrutiny

Minimal scrutiny is appropriate: a two-line diff touching only frontmatter metadata in blog posts, verified against git history to exactly match the pre-refresh commit values.

Other factors

I independently verified the candidate issue the bug hunter ruled out (BlogHeader's displayed date prop still reads '2026' while the frontmatter now says 2025). Checking the file's history before #3305, the BlogHeader date prop already did not match the frontmatter date (e.g. frontmatter said 2025/03/16 while BlogHeader showed 'February 20, 2026'), confirming this is a pre-existing, unrelated inconsistency rather than something introduced or left incomplete by this PR. No H1/format/link concerns since only frontmatter values changed.