How can crawl budget issues be detected with log file analysis?

Short answer: Server logs are the only direct record of what Googlebot actually crawls. Crawl budget problems become visible when you compare the distribution of logged requests against your inventory of valuable URLs: if budget flows into worthless URLs, you have a leak.

Step-by-step method

• Isolate Googlebot requests by user agent and verify them with reverse DNS; exclude fake bots.
• Segment requests by directory, status code, and URL type.
• Look for leak signals: a high share of 404s and redirects, parameter URL explosions, faceted navigation traps, requests hitting noindex pages.
• Chart the crawl frequency of priority pages; list URLs that sit in the sitemap but never get crawled.
• Cross-check findings against the Search Console Crawl Stats report.

Fixes usually mean robots.txt rules, clean canonicals, 410 for dead content, and internal link cleanup. TYS Digital Performance pipes log data into a queryable BigQuery report, turning the budget leak into a continuously monitored metric instead of a one-off audit.