java.lang.Object
- org.apache.nutch.metrics.NutchMetrics

```
public final class NutchMetrics
extends Object
```
Centralized constants for Hadoop metrics counter groups and names.
Follows Prometheus naming conventions:
- Counter groups use the nutch_ prefix namespace
- Counter names use snake_case
- Accumulating counters use _total suffix
- Units are included in counter names where applicable (e.g., _bytes)
Since:

1.22

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`CLEANING_DELETED_DOCUMENTS_TOTAL`	Documents deleted during cleaning.
`static String`	`CRAWLDB_GONE_RECORDS_REMOVED_TOTAL`	Gone (404) records removed during CrawlDb operations.
`static String`	`CRAWLDB_ORPHAN_RECORDS_REMOVED_TOTAL`	Orphan records removed during CrawlDb operations.
`static String`	`CRAWLDB_URLS_FILTERED_TOTAL`	URLs filtered during CrawlDb operations.
`static String`	`DEDUP_DOCUMENTS_MARKED_DUPLICATE_TOTAL`	Documents marked as duplicate.
`static String`	`DOMAIN_STATS_EMPTY_RESULT_TOTAL`	Empty results in domain statistics.
`static String`	`DOMAIN_STATS_FETCHED_TOTAL`	Fetched URLs in domain statistics.
`static String`	`DOMAIN_STATS_NOT_FETCHED_TOTAL`	Not fetched URLs in domain statistics.
`static String`	`ERROR_INDEXING_TOTAL`	Indexing filter errors.
`static String`	`ERROR_NETWORK_TOTAL`	Network-related errors.
`static String`	`ERROR_OTHER_TOTAL`	Other uncategorized errors.
`static String`	`ERROR_PARSING_TOTAL`	Parsing errors.
`static String`	`ERROR_PROTOCOL_TOTAL`	Protocol errors.
`static String`	`ERROR_SCORING_TOTAL`	Scoring filter errors.
`static String`	`ERROR_TIMEOUT_TOTAL`	Timeout errors.
`static String`	`ERROR_TOTAL`	Total errors across all categories.
`static String`	`ERROR_URL_TOTAL`	URL-related errors.
`static String`	`FETCHER_ABOVE_EXCEPTION_THRESHOLD_TOTAL`	URLs dropped due to exception threshold in queue.
`static String`	`FETCHER_BYTES_DOWNLOADED_TOTAL`	Total bytes downloaded by fetcher.
`static String`	`FETCHER_FILTERED_TOTAL`	URLs filtered during fetching.
`static String`	`FETCHER_HIT_BY_THROUGHPUT_THRESHOLD_TOTAL`	URLs hit by throughput threshold.
`static String`	`FETCHER_HIT_BY_TIMELIMIT_TOTAL`	URLs hit by time limit.
`static String`	`FETCHER_HIT_BY_TIMEOUT_TOTAL`	URLs hit by timeout.
`static String`	`FETCHER_HUNG_THREADS_TOTAL`	Threads that hung during fetching.
`static String`	`FETCHER_LATENCY`	Prefix for fetch latency metrics.
`static String`	`FETCHER_OUTLINKS_DETECTED_TOTAL`	Outlinks detected during parsing.
`static String`	`FETCHER_OUTLINKS_FOLLOWING_TOTAL`	Outlinks being followed.
`static String`	`FETCHER_REDIRECT_COUNT_EXCEEDED_TOTAL`	Redirects that exceeded maximum redirect count.
`static String`	`FETCHER_REDIRECT_DEDUPLICATED_TOTAL`	Redirects deduplicated (already seen).
`static String`	`FETCHER_REDIRECT_NOT_CREATED_TOTAL`	FetchItems not created for redirects.
`static String`	`FETCHER_ROBOTS_DEFER_VISITS_DROPPED_TOTAL`	URLs dropped due to robots.txt deferred visits.
`static String`	`FETCHER_ROBOTS_DENIED_MAXCRAWLDELAY_TOTAL`	URLs denied due to crawl delay exceeding maximum.
`static String`	`FETCHER_ROBOTS_DENIED_TOTAL`	URLs denied by robots.txt.
`static String`	`GENERATOR_EXPR_REJECTED_TOTAL`	URLs rejected by JEXL expression.
`static String`	`GENERATOR_HOSTS_AFFECTED_PER_HOST_OVERFLOW_TOTAL`	Hosts affected by per-host overflow.
`static String`	`GENERATOR_INTERVAL_REJECTED_TOTAL`	URLs rejected due to fetch interval exceeding threshold.
`static String`	`GENERATOR_SCHEDULE_REJECTED_TOTAL`	URLs rejected by fetch schedule.
`static String`	`GENERATOR_SCORE_TOO_LOW_TOTAL`	URLs rejected due to score below threshold.
`static String`	`GENERATOR_STATUS_REJECTED_TOTAL`	URLs rejected due to status restriction.
`static String`	`GENERATOR_URL_FILTERS_REJECTED_TOTAL`	URLs rejected by URL filters.
`static String`	`GENERATOR_URLS_SKIPPED_PER_HOST_OVERFLOW_TOTAL`	URLs skipped due to per-host overflow.
`static String`	`GENERATOR_WAIT_FOR_UPDATE_TOTAL`	URLs waiting for CrawlDb update.
`static String`	`GROUP_CLEANING`	Counter group for cleaning job operations.
`static String`	`GROUP_CRAWLDB`	Counter group for CrawlDb operations.
`static String`	`GROUP_CRAWLDB_FILTER`	Counter group for CrawlDb filter operations.
`static String`	`GROUP_DEDUP`	Counter group for deduplication operations.
`static String`	`GROUP_DOMAIN_STATS`	Counter group for domain statistics operations.
`static String`	`GROUP_FETCHER`	Counter group for fetcher operations.
`static String`	`GROUP_FETCHER_OUTLINKS`	Counter group for fetcher outlink processing.
`static String`	`GROUP_GENERATOR`	Counter group for generator operations.
`static String`	`GROUP_HOSTDB`	Counter group for HostDb operations.
`static String`	`GROUP_INDEXER`	Counter group for indexer operations.
`static String`	`GROUP_INJECTOR`	Counter group for injector operations.
`static String`	`GROUP_PARSER`	Counter group for parser operations.
`static String`	`GROUP_SITEMAP`	Counter group for sitemap processing operations.
`static String`	`GROUP_WARC_EXPORTER`	Counter group for WARC export operations.
`static String`	`GROUP_WEBGRAPH`	Counter group for WebGraph operations.
`static String`	`HOSTDB_CHECKED_HOSTS_TOTAL`	Hosts checked.
`static String`	`HOSTDB_EXISTING_KNOWN_HOST_TOTAL`	Existing known hosts.
`static String`	`HOSTDB_EXISTING_UNKNOWN_HOST_TOTAL`	Existing unknown hosts.
`static String`	`HOSTDB_FILTERED_RECORDS_TOTAL`	Records filtered in HostDb.
`static String`	`HOSTDB_NEW_KNOWN_HOST_TOTAL`	New known hosts discovered.
`static String`	`HOSTDB_NEW_UNKNOWN_HOST_TOTAL`	New unknown hosts.
`static String`	`HOSTDB_PURGED_UNKNOWN_HOST_TOTAL`	Purged unknown hosts.
`static String`	`HOSTDB_REDISCOVERED_HOST_TOTAL`	Rediscovered hosts.
`static String`	`HOSTDB_SKIPPED_NOT_ELIGIBLE_TOTAL`	Hosts skipped (not eligible).
`static String`	`HOSTDB_TOTAL_HOSTS_TOTAL`	Total hosts processed.
`static String`	`HOSTDB_URL_LIMIT_NOT_REACHED_TOTAL`	Hosts where URL limit was not reached.
`static String`	`INDEXER_DELETED_BY_INDEXING_FILTER_TOTAL`	Documents deleted by indexing filter.
`static String`	`INDEXER_DELETED_DUPLICATES_TOTAL`	Documents deleted as duplicates.
`static String`	`INDEXER_DELETED_GONE_TOTAL`	Documents deleted because they are gone.
`static String`	`INDEXER_DELETED_REDIRECTS_TOTAL`	Documents deleted due to redirects.
`static String`	`INDEXER_DELETED_ROBOTS_NOINDEX_TOTAL`	Documents deleted due to robots noindex.
`static String`	`INDEXER_INDEXED_TOTAL`	Documents indexed (added or updated).
`static String`	`INDEXER_LATENCY`	Prefix for indexer latency metrics.
`static String`	`INDEXER_SKIPPED_BY_INDEXING_FILTER_TOTAL`	Documents skipped by indexing filter.
`static String`	`INDEXER_SKIPPED_NOT_MODIFIED_TOTAL`	Documents skipped (not modified).
`static String`	`INJECTOR_URLS_FILTERED_TOTAL`	URLs filtered during injection.
`static String`	`INJECTOR_URLS_INJECTED_TOTAL`	URLs injected.
`static String`	`INJECTOR_URLS_INJECTED_UNIQUE_TOTAL`	Unique URLs injected.
`static String`	`INJECTOR_URLS_MERGED_TOTAL`	URLs merged with existing CrawlDb entries.
`static String`	`INJECTOR_URLS_PURGED_404_TOTAL`	URLs purged due to 404 status.
`static String`	`INJECTOR_URLS_PURGED_FILTER_TOTAL`	URLs purged by filter.
`static String`	`PARSER_LATENCY`	Prefix for parse latency metrics.
`static String`	`SITEMAP_EXISTING_ENTRIES_TOTAL`	Existing sitemap entries.
`static String`	`SITEMAP_FAILED_FETCHES_TOTAL`	Failed sitemap fetches.
`static String`	`SITEMAP_FILTERED_FROM_HOSTNAME_TOTAL`	Sitemaps filtered from hostname.
`static String`	`SITEMAP_FILTERED_RECORDS_TOTAL`	Filtered records in sitemap processing.
`static String`	`SITEMAP_FROM_HOSTNAME_TOTAL`	Sitemaps discovered from hostname.
`static String`	`SITEMAP_NEW_ENTRIES_TOTAL`	New sitemap entries.
`static String`	`SITEMAP_SEEDS_TOTAL`	Seeds extracted from sitemaps.
`static String`	`WARC_MISSING_CONTENT_TOTAL`	Missing content in WARC export.
`static String`	`WARC_MISSING_METADATA_TOTAL`	Missing metadata in WARC export.
`static String`	`WARC_OMITTED_EMPTY_RESPONSE_TOTAL`	Omitted empty responses in WARC export.
`static String`	`WARC_RECORDS_GENERATED_TOTAL`	WARC records generated.
`static String`	`WEBGRAPH_ADDED_LINKS_TOTAL`	Links added to WebGraph.
`static String`	`WEBGRAPH_REMOVED_LINKS_TOTAL`	Links removed from WebGraph.

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - GROUP_FETCHER
```
public static final String GROUP_FETCHER
```
    Counter group for fetcher operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_FETCHER_OUTLINKS
```
public static final String GROUP_FETCHER_OUTLINKS
```
    Counter group for fetcher outlink processing.
    
    See Also:
    
    Constant Field Values
  - GROUP_GENERATOR
```
public static final String GROUP_GENERATOR
```
    Counter group for generator operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_INDEXER
```
public static final String GROUP_INDEXER
```
    Counter group for indexer operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_CRAWLDB
```
public static final String GROUP_CRAWLDB
```
    Counter group for CrawlDb operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_CRAWLDB_FILTER
```
public static final String GROUP_CRAWLDB_FILTER
```
    Counter group for CrawlDb filter operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_INJECTOR
```
public static final String GROUP_INJECTOR
```
    Counter group for injector operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_HOSTDB
```
public static final String GROUP_HOSTDB
```
    Counter group for HostDb operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_PARSER
```
public static final String GROUP_PARSER
```
    Counter group for parser operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_DEDUP
```
public static final String GROUP_DEDUP
```
    Counter group for deduplication operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_CLEANING
```
public static final String GROUP_CLEANING
```
    Counter group for cleaning job operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_WEBGRAPH
```
public static final String GROUP_WEBGRAPH
```
    Counter group for WebGraph operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_SITEMAP
```
public static final String GROUP_SITEMAP
```
    Counter group for sitemap processing operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_WARC_EXPORTER
```
public static final String GROUP_WARC_EXPORTER
```
    Counter group for WARC export operations.
    
    See Also:
    
    Constant Field Values
  - GROUP_DOMAIN_STATS
```
public static final String GROUP_DOMAIN_STATS
```
    Counter group for domain statistics operations.
    
    See Also:
    
    Constant Field Values
  - FETCHER_BYTES_DOWNLOADED_TOTAL
```
public static final String FETCHER_BYTES_DOWNLOADED_TOTAL
```
    Total bytes downloaded by fetcher.
    
    See Also:
    
    Constant Field Values
  - FETCHER_ROBOTS_DENIED_TOTAL
```
public static final String FETCHER_ROBOTS_DENIED_TOTAL
```
    URLs denied by robots.txt.
    
    See Also:
    
    Constant Field Values
  - FETCHER_ROBOTS_DENIED_MAXCRAWLDELAY_TOTAL
```
public static final String FETCHER_ROBOTS_DENIED_MAXCRAWLDELAY_TOTAL
```
    URLs denied due to crawl delay exceeding maximum.
    
    See Also:
    
    Constant Field Values
  - FETCHER_ROBOTS_DEFER_VISITS_DROPPED_TOTAL
```
public static final String FETCHER_ROBOTS_DEFER_VISITS_DROPPED_TOTAL
```
    URLs dropped due to robots.txt deferred visits.
    
    See Also:
    
    Constant Field Values
  - FETCHER_REDIRECT_COUNT_EXCEEDED_TOTAL
```
public static final String FETCHER_REDIRECT_COUNT_EXCEEDED_TOTAL
```
    Redirects that exceeded maximum redirect count.
    
    See Also:
    
    Constant Field Values
  - FETCHER_REDIRECT_DEDUPLICATED_TOTAL
```
public static final String FETCHER_REDIRECT_DEDUPLICATED_TOTAL
```
    Redirects deduplicated (already seen).
    
    See Also:
    
    Constant Field Values
  - FETCHER_REDIRECT_NOT_CREATED_TOTAL
```
public static final String FETCHER_REDIRECT_NOT_CREATED_TOTAL
```
    FetchItems not created for redirects.
    
    See Also:
    
    Constant Field Values
  - FETCHER_HIT_BY_TIMELIMIT_TOTAL
```
public static final String FETCHER_HIT_BY_TIMELIMIT_TOTAL
```
    URLs hit by time limit.
    
    See Also:
    
    Constant Field Values
  - FETCHER_HIT_BY_TIMEOUT_TOTAL
```
public static final String FETCHER_HIT_BY_TIMEOUT_TOTAL
```
    URLs hit by timeout.
    
    See Also:
    
    Constant Field Values
  - FETCHER_HIT_BY_THROUGHPUT_THRESHOLD_TOTAL
```
public static final String FETCHER_HIT_BY_THROUGHPUT_THRESHOLD_TOTAL
```
    URLs hit by throughput threshold.
    
    See Also:
    
    Constant Field Values
  - FETCHER_HUNG_THREADS_TOTAL
```
public static final String FETCHER_HUNG_THREADS_TOTAL
```
    Threads that hung during fetching.
    
    See Also:
    
    Constant Field Values
  - FETCHER_FILTERED_TOTAL
```
public static final String FETCHER_FILTERED_TOTAL
```
    URLs filtered during fetching.
    
    See Also:
    
    Constant Field Values
  - FETCHER_ABOVE_EXCEPTION_THRESHOLD_TOTAL
```
public static final String FETCHER_ABOVE_EXCEPTION_THRESHOLD_TOTAL
```
    URLs dropped due to exception threshold in queue.
    
    See Also:
    
    Constant Field Values
  - FETCHER_OUTLINKS_DETECTED_TOTAL
```
public static final String FETCHER_OUTLINKS_DETECTED_TOTAL
```
    Outlinks detected during parsing.
    
    See Also:
    
    Constant Field Values
  - FETCHER_OUTLINKS_FOLLOWING_TOTAL
```
public static final String FETCHER_OUTLINKS_FOLLOWING_TOTAL
```
    Outlinks being followed.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_URL_FILTERS_REJECTED_TOTAL
```
public static final String GENERATOR_URL_FILTERS_REJECTED_TOTAL
```
    URLs rejected by URL filters.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_SCHEDULE_REJECTED_TOTAL
```
public static final String GENERATOR_SCHEDULE_REJECTED_TOTAL
```
    URLs rejected by fetch schedule.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_WAIT_FOR_UPDATE_TOTAL
```
public static final String GENERATOR_WAIT_FOR_UPDATE_TOTAL
```
    URLs waiting for CrawlDb update.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_EXPR_REJECTED_TOTAL
```
public static final String GENERATOR_EXPR_REJECTED_TOTAL
```
    URLs rejected by JEXL expression.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_STATUS_REJECTED_TOTAL
```
public static final String GENERATOR_STATUS_REJECTED_TOTAL
```
    URLs rejected due to status restriction.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_SCORE_TOO_LOW_TOTAL
```
public static final String GENERATOR_SCORE_TOO_LOW_TOTAL
```
    URLs rejected due to score below threshold.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_INTERVAL_REJECTED_TOTAL
```
public static final String GENERATOR_INTERVAL_REJECTED_TOTAL
```
    URLs rejected due to fetch interval exceeding threshold.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_URLS_SKIPPED_PER_HOST_OVERFLOW_TOTAL
```
public static final String GENERATOR_URLS_SKIPPED_PER_HOST_OVERFLOW_TOTAL
```
    URLs skipped due to per-host overflow.
    
    See Also:
    
    Constant Field Values
  - GENERATOR_HOSTS_AFFECTED_PER_HOST_OVERFLOW_TOTAL
```
public static final String GENERATOR_HOSTS_AFFECTED_PER_HOST_OVERFLOW_TOTAL
```
    Hosts affected by per-host overflow.
    
    See Also:
    
    Constant Field Values
  - INDEXER_DELETED_ROBOTS_NOINDEX_TOTAL
```
public static final String INDEXER_DELETED_ROBOTS_NOINDEX_TOTAL
```
    Documents deleted due to robots noindex.
    
    See Also:
    
    Constant Field Values
  - INDEXER_DELETED_GONE_TOTAL
```
public static final String INDEXER_DELETED_GONE_TOTAL
```
    Documents deleted because they are gone.
    
    See Also:
    
    Constant Field Values
  - INDEXER_DELETED_REDIRECTS_TOTAL
```
public static final String INDEXER_DELETED_REDIRECTS_TOTAL
```
    Documents deleted due to redirects.
    
    See Also:
    
    Constant Field Values
  - INDEXER_DELETED_DUPLICATES_TOTAL
```
public static final String INDEXER_DELETED_DUPLICATES_TOTAL
```
    Documents deleted as duplicates.
    
    See Also:
    
    Constant Field Values
  - INDEXER_DELETED_BY_INDEXING_FILTER_TOTAL
```
public static final String INDEXER_DELETED_BY_INDEXING_FILTER_TOTAL
```
    Documents deleted by indexing filter.
    
    See Also:
    
    Constant Field Values
  - INDEXER_SKIPPED_NOT_MODIFIED_TOTAL
```
public static final String INDEXER_SKIPPED_NOT_MODIFIED_TOTAL
```
    Documents skipped (not modified).
    
    See Also:
    
    Constant Field Values
  - INDEXER_SKIPPED_BY_INDEXING_FILTER_TOTAL
```
public static final String INDEXER_SKIPPED_BY_INDEXING_FILTER_TOTAL
```
    Documents skipped by indexing filter.
    
    See Also:
    
    Constant Field Values
  - INDEXER_INDEXED_TOTAL
```
public static final String INDEXER_INDEXED_TOTAL
```
    Documents indexed (added or updated).
    
    See Also:
    
    Constant Field Values
  - CRAWLDB_URLS_FILTERED_TOTAL
```
public static final String CRAWLDB_URLS_FILTERED_TOTAL
```
    URLs filtered during CrawlDb operations.
    
    See Also:
    
    Constant Field Values
  - CRAWLDB_GONE_RECORDS_REMOVED_TOTAL
```
public static final String CRAWLDB_GONE_RECORDS_REMOVED_TOTAL
```
    Gone (404) records removed during CrawlDb operations.
    
    See Also:
    
    Constant Field Values
  - CRAWLDB_ORPHAN_RECORDS_REMOVED_TOTAL
```
public static final String CRAWLDB_ORPHAN_RECORDS_REMOVED_TOTAL
```
    Orphan records removed during CrawlDb operations.
    
    See Also:
    
    Constant Field Values
  - INJECTOR_URLS_FILTERED_TOTAL
```
public static final String INJECTOR_URLS_FILTERED_TOTAL
```
    URLs filtered during injection.
    
    See Also:
    
    Constant Field Values
  - INJECTOR_URLS_INJECTED_TOTAL
```
public static final String INJECTOR_URLS_INJECTED_TOTAL
```
    URLs injected.
    
    See Also:
    
    Constant Field Values
  - INJECTOR_URLS_INJECTED_UNIQUE_TOTAL
```
public static final String INJECTOR_URLS_INJECTED_UNIQUE_TOTAL
```
    Unique URLs injected.
    
    See Also:
    
    Constant Field Values
  - INJECTOR_URLS_MERGED_TOTAL
```
public static final String INJECTOR_URLS_MERGED_TOTAL
```
    URLs merged with existing CrawlDb entries.
    
    See Also:
    
    Constant Field Values
  - INJECTOR_URLS_PURGED_404_TOTAL
```
public static final String INJECTOR_URLS_PURGED_404_TOTAL
```
    URLs purged due to 404 status.
    
    See Also:
    
    Constant Field Values
  - INJECTOR_URLS_PURGED_FILTER_TOTAL
```
public static final String INJECTOR_URLS_PURGED_FILTER_TOTAL
```
    URLs purged by filter.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_FILTERED_RECORDS_TOTAL
```
public static final String HOSTDB_FILTERED_RECORDS_TOTAL
```
    Records filtered in HostDb.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_TOTAL_HOSTS_TOTAL
```
public static final String HOSTDB_TOTAL_HOSTS_TOTAL
```
    Total hosts processed.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_SKIPPED_NOT_ELIGIBLE_TOTAL
```
public static final String HOSTDB_SKIPPED_NOT_ELIGIBLE_TOTAL
```
    Hosts skipped (not eligible).
    
    See Also:
    
    Constant Field Values
  - HOSTDB_URL_LIMIT_NOT_REACHED_TOTAL
```
public static final String HOSTDB_URL_LIMIT_NOT_REACHED_TOTAL
```
    Hosts where URL limit was not reached.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_NEW_KNOWN_HOST_TOTAL
```
public static final String HOSTDB_NEW_KNOWN_HOST_TOTAL
```
    New known hosts discovered.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_REDISCOVERED_HOST_TOTAL
```
public static final String HOSTDB_REDISCOVERED_HOST_TOTAL
```
    Rediscovered hosts.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_EXISTING_KNOWN_HOST_TOTAL
```
public static final String HOSTDB_EXISTING_KNOWN_HOST_TOTAL
```
    Existing known hosts.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_NEW_UNKNOWN_HOST_TOTAL
```
public static final String HOSTDB_NEW_UNKNOWN_HOST_TOTAL
```
    New unknown hosts.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_EXISTING_UNKNOWN_HOST_TOTAL
```
public static final String HOSTDB_EXISTING_UNKNOWN_HOST_TOTAL
```
    Existing unknown hosts.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_PURGED_UNKNOWN_HOST_TOTAL
```
public static final String HOSTDB_PURGED_UNKNOWN_HOST_TOTAL
```
    Purged unknown hosts.
    
    See Also:
    
    Constant Field Values
  - HOSTDB_CHECKED_HOSTS_TOTAL
```
public static final String HOSTDB_CHECKED_HOSTS_TOTAL
```
    Hosts checked.
    
    See Also:
    
    Constant Field Values
  - DEDUP_DOCUMENTS_MARKED_DUPLICATE_TOTAL
```
public static final String DEDUP_DOCUMENTS_MARKED_DUPLICATE_TOTAL
```
    Documents marked as duplicate.
    
    See Also:
    
    Constant Field Values
  - CLEANING_DELETED_DOCUMENTS_TOTAL
```
public static final String CLEANING_DELETED_DOCUMENTS_TOTAL
```
    Documents deleted during cleaning.
    
    See Also:
    
    Constant Field Values
  - WEBGRAPH_ADDED_LINKS_TOTAL
```
public static final String WEBGRAPH_ADDED_LINKS_TOTAL
```
    Links added to WebGraph.
    
    See Also:
    
    Constant Field Values
  - WEBGRAPH_REMOVED_LINKS_TOTAL
```
public static final String WEBGRAPH_REMOVED_LINKS_TOTAL
```
    Links removed from WebGraph.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_FILTERED_RECORDS_TOTAL
```
public static final String SITEMAP_FILTERED_RECORDS_TOTAL
```
    Filtered records in sitemap processing.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_SEEDS_TOTAL
```
public static final String SITEMAP_SEEDS_TOTAL
```
    Seeds extracted from sitemaps.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_FROM_HOSTNAME_TOTAL
```
public static final String SITEMAP_FROM_HOSTNAME_TOTAL
```
    Sitemaps discovered from hostname.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_FILTERED_FROM_HOSTNAME_TOTAL
```
public static final String SITEMAP_FILTERED_FROM_HOSTNAME_TOTAL
```
    Sitemaps filtered from hostname.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_FAILED_FETCHES_TOTAL
```
public static final String SITEMAP_FAILED_FETCHES_TOTAL
```
    Failed sitemap fetches.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_EXISTING_ENTRIES_TOTAL
```
public static final String SITEMAP_EXISTING_ENTRIES_TOTAL
```
    Existing sitemap entries.
    
    See Also:
    
    Constant Field Values
  - SITEMAP_NEW_ENTRIES_TOTAL
```
public static final String SITEMAP_NEW_ENTRIES_TOTAL
```
    New sitemap entries.
    
    See Also:
    
    Constant Field Values
  - WARC_MISSING_CONTENT_TOTAL
```
public static final String WARC_MISSING_CONTENT_TOTAL
```
    Missing content in WARC export.
    
    See Also:
    
    Constant Field Values
  - WARC_MISSING_METADATA_TOTAL
```
public static final String WARC_MISSING_METADATA_TOTAL
```
    Missing metadata in WARC export.
    
    See Also:
    
    Constant Field Values
  - WARC_OMITTED_EMPTY_RESPONSE_TOTAL
```
public static final String WARC_OMITTED_EMPTY_RESPONSE_TOTAL
```
    Omitted empty responses in WARC export.
    
    See Also:
    
    Constant Field Values
  - WARC_RECORDS_GENERATED_TOTAL
```
public static final String WARC_RECORDS_GENERATED_TOTAL
```
    WARC records generated.
    
    See Also:
    
    Constant Field Values
  - DOMAIN_STATS_FETCHED_TOTAL
```
public static final String DOMAIN_STATS_FETCHED_TOTAL
```
    Fetched URLs in domain statistics.
    
    See Also:
    
    Constant Field Values
  - DOMAIN_STATS_NOT_FETCHED_TOTAL
```
public static final String DOMAIN_STATS_NOT_FETCHED_TOTAL
```
    Not fetched URLs in domain statistics.
    
    See Also:
    
    Constant Field Values
  - DOMAIN_STATS_EMPTY_RESULT_TOTAL
```
public static final String DOMAIN_STATS_EMPTY_RESULT_TOTAL
```
    Empty results in domain statistics.
    
    See Also:
    
    Constant Field Values
  - FETCHER_LATENCY
```
public static final String FETCHER_LATENCY
```
    Prefix for fetch latency metrics. Used with LatencyTracker to emit fetch timing counters.
    
    See Also:
    
    Constant Field Values
  - PARSER_LATENCY
```
public static final String PARSER_LATENCY
```
    Prefix for parse latency metrics. Used with LatencyTracker to emit parse timing counters.
    
    See Also:
    
    Constant Field Values
  - INDEXER_LATENCY
```
public static final String INDEXER_LATENCY
```
    Prefix for indexer latency metrics. Used with LatencyTracker to emit indexing timing counters.
    
    See Also:
    
    Constant Field Values
  - ERROR_TOTAL
```
public static final String ERROR_TOTAL
```
    Total errors across all categories. This is incremented alongside any category-specific error counter.
    
    See Also:
    
    Constant Field Values
  - ERROR_NETWORK_TOTAL
```
public static final String ERROR_NETWORK_TOTAL
```
    Network-related errors. Includes: IOException, SocketException, ConnectException, UnknownHostException
    
    See Also:
    
    Constant Field Values
  - ERROR_PROTOCOL_TOTAL
```
public static final String ERROR_PROTOCOL_TOTAL
```
    Protocol errors. Includes: ProtocolException, ProtocolNotFound
    
    See Also:
    
    Constant Field Values
  - ERROR_PARSING_TOTAL
```
public static final String ERROR_PARSING_TOTAL
```
    Parsing errors. Includes: ParseException, ParserNotFound
    
    See Also:
    
    Constant Field Values
  - ERROR_URL_TOTAL
```
public static final String ERROR_URL_TOTAL
```
    URL-related errors. Includes: MalformedURLException, URLFilterException
    
    See Also:
    
    Constant Field Values
  - ERROR_SCORING_TOTAL
```
public static final String ERROR_SCORING_TOTAL
```
    Scoring filter errors. Includes: ScoringFilterException
    
    See Also:
    
    Constant Field Values
  - ERROR_INDEXING_TOTAL
```
public static final String ERROR_INDEXING_TOTAL
```
    Indexing filter errors. Includes: IndexingException
    
    See Also:
    
    Constant Field Values
  - ERROR_TIMEOUT_TOTAL
```
public static final String ERROR_TIMEOUT_TOTAL
```
    Timeout errors. Includes: SocketTimeoutException, connection timeouts
    
    See Also:
    
    Constant Field Values
  - ERROR_OTHER_TOTAL
```
public static final String ERROR_OTHER_TOTAL
```
    Other uncategorized errors. Used as fallback for exceptions not matching any specific category.
    
    See Also:
    
    Constant Field Values

Class NutchMetrics

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

GROUP_FETCHER

GROUP_FETCHER_OUTLINKS

GROUP_GENERATOR

GROUP_INDEXER

GROUP_CRAWLDB

GROUP_CRAWLDB_FILTER

GROUP_INJECTOR

GROUP_HOSTDB

GROUP_PARSER

GROUP_DEDUP

GROUP_CLEANING

GROUP_WEBGRAPH

GROUP_SITEMAP

GROUP_WARC_EXPORTER

GROUP_DOMAIN_STATS

FETCHER_BYTES_DOWNLOADED_TOTAL

FETCHER_ROBOTS_DENIED_TOTAL

FETCHER_ROBOTS_DENIED_MAXCRAWLDELAY_TOTAL

FETCHER_ROBOTS_DEFER_VISITS_DROPPED_TOTAL

FETCHER_REDIRECT_COUNT_EXCEEDED_TOTAL

FETCHER_REDIRECT_DEDUPLICATED_TOTAL

FETCHER_REDIRECT_NOT_CREATED_TOTAL

FETCHER_HIT_BY_TIMELIMIT_TOTAL

FETCHER_HIT_BY_TIMEOUT_TOTAL

FETCHER_HIT_BY_THROUGHPUT_THRESHOLD_TOTAL

FETCHER_HUNG_THREADS_TOTAL

FETCHER_FILTERED_TOTAL

FETCHER_ABOVE_EXCEPTION_THRESHOLD_TOTAL

FETCHER_OUTLINKS_DETECTED_TOTAL

FETCHER_OUTLINKS_FOLLOWING_TOTAL

GENERATOR_URL_FILTERS_REJECTED_TOTAL

GENERATOR_SCHEDULE_REJECTED_TOTAL

GENERATOR_WAIT_FOR_UPDATE_TOTAL

GENERATOR_EXPR_REJECTED_TOTAL

GENERATOR_STATUS_REJECTED_TOTAL

GENERATOR_SCORE_TOO_LOW_TOTAL

GENERATOR_INTERVAL_REJECTED_TOTAL

GENERATOR_URLS_SKIPPED_PER_HOST_OVERFLOW_TOTAL

GENERATOR_HOSTS_AFFECTED_PER_HOST_OVERFLOW_TOTAL

INDEXER_DELETED_ROBOTS_NOINDEX_TOTAL

INDEXER_DELETED_GONE_TOTAL

INDEXER_DELETED_REDIRECTS_TOTAL

INDEXER_DELETED_DUPLICATES_TOTAL

INDEXER_DELETED_BY_INDEXING_FILTER_TOTAL

INDEXER_SKIPPED_NOT_MODIFIED_TOTAL

INDEXER_SKIPPED_BY_INDEXING_FILTER_TOTAL

INDEXER_INDEXED_TOTAL

CRAWLDB_URLS_FILTERED_TOTAL

CRAWLDB_GONE_RECORDS_REMOVED_TOTAL

CRAWLDB_ORPHAN_RECORDS_REMOVED_TOTAL

INJECTOR_URLS_FILTERED_TOTAL

INJECTOR_URLS_INJECTED_TOTAL

INJECTOR_URLS_INJECTED_UNIQUE_TOTAL

INJECTOR_URLS_MERGED_TOTAL

INJECTOR_URLS_PURGED_404_TOTAL

INJECTOR_URLS_PURGED_FILTER_TOTAL

HOSTDB_FILTERED_RECORDS_TOTAL

HOSTDB_TOTAL_HOSTS_TOTAL

HOSTDB_SKIPPED_NOT_ELIGIBLE_TOTAL

HOSTDB_URL_LIMIT_NOT_REACHED_TOTAL

HOSTDB_NEW_KNOWN_HOST_TOTAL

HOSTDB_REDISCOVERED_HOST_TOTAL

HOSTDB_EXISTING_KNOWN_HOST_TOTAL

HOSTDB_NEW_UNKNOWN_HOST_TOTAL

HOSTDB_EXISTING_UNKNOWN_HOST_TOTAL

HOSTDB_PURGED_UNKNOWN_HOST_TOTAL

HOSTDB_CHECKED_HOSTS_TOTAL

DEDUP_DOCUMENTS_MARKED_DUPLICATE_TOTAL

CLEANING_DELETED_DOCUMENTS_TOTAL

WEBGRAPH_ADDED_LINKS_TOTAL

WEBGRAPH_REMOVED_LINKS_TOTAL

SITEMAP_FILTERED_RECORDS_TOTAL

SITEMAP_SEEDS_TOTAL

SITEMAP_FROM_HOSTNAME_TOTAL

SITEMAP_FILTERED_FROM_HOSTNAME_TOTAL