mtools Log Analysis Integration
Parent: FTDC and Log Tooling · Published reference · snapshot 2026-10-23 · viability 3.80 / 5 (research)
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Source-anchored research for mtools Log Analysis Integration. Run status: COMPLETED.
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Definitions
- mtools is a Python helper suite for parsing, filtering, and visualizing MongoDB mongod and mongos logs: mloginfo summarizes log metadata and activity, mlogfilter slices, merges, and filters log lines, and mplotqueries visualizes operations. (high confidence) [source]
- mtools is a Python command-line collection for parsing, filtering, and visualizing MongoDB mongod and mongos log files; it includes mlogfilter, mloginfo, mplotqueries, and mlaunch for creating local test deployments. (high confidence) [source]
How it works
- MongoDB's manual says mongod and mongos log output changed from plaintext to structured JSON, and Percona's March 14, 2024 article reports that mplotqueries stopped working when MongoDB 4.4 introduced the JSON log format. (high confidence) [source]
Problems, failure modes and limitations
- The mlogfilter page retrieved on 2026-10-23 documents --json as output containing extracted fields such as datetime, operation, namespace, counters, and duration for mongoimport, while separately warning that it does not parse native logv2 input; the JSON flag is therefore not evidence of native logv2 compatibility. (medium confidence) (verified as of 2026-10-23) [source]
- The mlogfilter documentation shows a legacy-log export pipeline (mlogfilter mongod.log --slow --json | mongoimport ...) that stores each selected line as a MongoDB document with extracted fields such as datetime, namespace, duration, and query counts. (low confidence) [source]
Comparisons and alternatives
- A May 18, 2022 MongoDB Community answer describes mtools as local scripts, Compass Performance as real-time metrics rather than log-file analysis, and Atlas logs as downloadable for offline tools; MongoDB's manual also documents downloading Atlas logs. (medium confidence) [source]
Facts and statements
- mtools composes through files and shell pipes: mlogfilter accepts one or more logs or stdin, can merge files by timestamp, filter by dates, namespace, or operation, and emit parsed JSON for mongoimport; filtered output can feed mplotqueries for charts. (high confidence) [source]
- MongoDB's manual describes native server logs as structured JSON key-value objects that can be filtered with standard JSON tools and consumed by some ingestion services; a MongoDB community contributor also recommends jq for this workflow. (high confidence) [source]
- The mtools 1.7.2 documentation says mlogfilter and mplotqueries do not support MongoDB logv2 (4.4+). Percona's March 2024 article reports that mplotqueries stopped working after MongoDB 4.4 introduced JSON logs. An October 2026 mdbkit README describes mtools' log tools as never having learned to read JSON logs introduced in 4.4. Users should verify behavior against the exact installed release before relying on these tools with unconverted JSON logs. (medium confidence) (verified as of 2026-10-23) [source]
- The documented log workflow is file- and pipe-based: mlogfilter merges multiple log files by timestamp and filters by time, namespace, operation, thread, duration, text, or scan; its output can be piped into mplotqueries for histogram and other plots. (high confidence) [source]
Children
- No children recorded.