Prove Splunk is working — first tool + proof field

1. Why “is Splunk working?” is five questions

Operators collapse five failures into one sentence. The search head cannot search. User data never landed. One host’s sourcetype went silent. The indexer is delayed. A high notable sits Unassigned. Those are five first clicks.

This page is the night-shift desk for proof. The factory taught the sentence: index + time + count. Here you learn the six surfaces you actually open, in order, when someone asks you to prove Splunk is working — and why there are no events.

Hero · six tiles, one ticket

2. Mental model — six proof surfaces

Memorise six named objects before you click. Each surface is allowed to prove one thing. Over-claiming a field is how you bounce a healthy indexer at 02:00.

3. Decision flow — ticket → first tool

Flowchart first. Do not open the indexer CLI until a diamond says so.

Path · pick the branch before the menu

4. How to choose — first tool + proof field

Print this next to the search head. If you cannot recite the proof field, you are not ready to change anything.

5. Runbook Side A → B → C

Side A proves the search head and the user-data question. Side B proves the pipe (Monitoring Console indexing + forwarder Status). Side C proves the ES queue if Enterprise Security is installed. On a messy Sev-2, do them in this order until a field lights up.

Side A — Search, last event, sourcetype

1. Prove the search head with index=_internal

   Path: Splunk Home → Search & Reporting (Search Summary, then New Search after you run). Official: About the Search app — type index=_internal and press Enter to look at events from internal log files. Set the Time range picker (default Last 24 hours). Quote the job event count and the newest _time on the Events tab.

2. If _internal is live, ask the user-data question

   Same Search bar: index=* in the same window. Then name the index the ticket actually cares about (index=wineventlog, index=netfw — lab names only). Official “I can’t find my data”: your time range could be excluding the events — search over All time to verify before you page platform.

3. Read Latest event, then sourcetype

   Path: Settings → Indexes (Create custom indexes). Quote Latest event for that index. Or run | tstats count latest(_time) as last_event where index=<name> by sourcetype (tstats uses index-time fields). Data Summary tabs are Hosts, Sources, Sourcetypes — pick Sourcetypes to name the missing kind.

4. Pin timezone with the window

   Official: How time zones are processed — _time is converted to the user-profile timezone on the search head. An IST “Last 4 hours” at 10:00 will miss a 02:00 UTC incident. Write the timezone next to earliest / latest. This is still Side A. It is not an indexer outage.

Path:     Apps → Search & Reporting
Prove SH: index=_internal   picker=Last 15 minutes
Quote:    event count + newest _time + user timezone
User data: index=*   then index=<named>
Latest:   Settings → Indexes → Latest event
          or | tstats count latest(_time) as last_event
             where index=<named> by sourcetype
Empty?:   Search All time before you page platform
          (I can’t find my data)

Side B — Monitoring Console indexing + forwarder Status

1. Open Forwarders first when one host is silent

   Path: Settings → Monitoring Console → Forwarders: Deployment (configure Forwarder Monitoring Setup first — official prerequisite). Quote Status: active if the forwarder connected to an indexer in the last 15 minutes; missing if it did not. The lookback is not the data-collection interval. Rebuild the forwarder asset table only to drop permanently gone hosts.

2. Then Splunk TCP Input, then Indexing

   Official order if you cannot find indexed data: (1) Forwarder views (2) Splunk TCP Input views (3) Indexing views. Monitoring Console does not query forwarders directly — it reads indexer metrics.log. Path for indexing: Indexing: Performance and Indexing: Indexes and Volumes.

3. If everything is late, including internal logs, treat it as forwarding

   Official Event indexing delay: index=_internal source=*splunkd.log* | eval delay_sec=_indextime-_time | timechart min(delay_sec) avg(delay_sec) max(delay_sec) by host. Compare with the user source. If all logs are delayed, including internal, the delay is a forwarding issue. Universal / light forwarders default thruput is 256 KBps.

Side C — Incident Review (only if ES is present)

1. Open Incident Review, not a new correlation search

   Path: Splunk Enterprise Security menu bar → Incident Review. Official ES 7 user guide: the dashboard displays notable events and current status. Filter time, then Owner / Status / Urgency. ES 8 re-architected some pages — if your tenant says Mission Control / Analyst Queue, use that equivalent. If ES is not installed, stop after Side B.

2. Assign Owner before you hunt

   Official workflow: administrative analyst assigns the notable; reviewing analyst sets Status from New to In Progress, records Comments, then Resolved / Closed. Proof fields: Owner (Unassigned is a process miss), Status, Urgency (Critical / High / Medium / Low / Informational / Unknown).

3. Do not disable the correlation search at 02:00

   A noisy high notable with a healthy last-run is isolate, not change-control. The factory lesson covers CIM when user is empty. This desk only asks: is the notable owned, and did Side A already prove the contributing index is searchable?

6. Five tickets as full stories

These five land every quarter. Memorise first tool + proof field. Times and identities below are lab-only.

SPED-01 — Prove the search head (index=_internal)

01:42 · P2. Priya: “Splunk is down.” Someone already drafted an indexer restart window.

First tool: Apps → Search & Reporting. Search bar index=_internal. Picker Last 15 minutes.

If events exist: quote the count and the newest _time. Splunk is searching and writing internal logs. You are now allowed to ask the user-data question. _internal is not a customer sourcetype.

If empty: widen to Last 60 minutes / All time (official “I can’t find my data”). Still empty → Side B Indexing, not a new notable.

SPED-02 — Prove last event time and sourcetype

02:05 · P2. After last night’s TA ship, the app team searched index=main Last 15 minutes and got 0. They want the index rebuilt.

First tool: same Search app. index=_internal first (SPED-01). Then index=*. Then the index the TA actually writes — not main by habit. Open Settings → Indexes and read Latest event.

Proof field: Latest event on wineventlog (lab) is 01:58 UTC, sourcetype WinEventLog:Security. index=main Latest event is yesterday. The events are not missing. The search is on the wrong index. Re-run the TA’s documented index + sourcetype in the ticket window.

SPED-03 — Prove forwarder Status

02:20 · P1. Pune branch firewall logs vanished at 02:00 after a jump-host change. Other sites still index cisco:asa.

First tool: Monitoring Console → Forwarders: Deployment. Filter the Pune GUID / hostname.

Proof field: Status = missing (no connection in the 15-minute lookback). Peer uf-pune-01 is active. Next official views: Splunk TCP Input, then Indexing. Do not disable the sourcetype on healthy peers. Do not declare a tenant indexing outage from one missing GUID.

SPED-04 — Prove indexing delay (internal logs late too)

02:40 · P2. SOC: “events are 40 minutes late.” Someone wants the indexers restarted.

First tool: Monitoring Console → Indexing: Performance, then the official delay searches.

Proof field: delay_sec on index=_internal source=*splunkd.log* and on the user source, by host. Official rule: if all logs are delayed, including internal, it is a forwarding issue (thruput, blocked output, receiver). If only the user source is late, stay on that input / timezone / _time extraction — not a cluster bounce.

SPED-05 — Prove the notable (ES if present)

03:00 · P2. High notable “MFA spike” sits Unassigned. L1 wants the correlation search disabled.

First tool: ES → Incident Review. If ES is not installed, this ticket is not an ES ticket — go back to Side A count.

Proof field: Owner = Unassigned, Status = New, Urgency = High. Official first action is assign, then In Progress, then investigate. Side A must already show the contributing index is searchable. Disabling the search is a change window, not isolate.

7. Traps + close-the-ticket proof

Proof · named field, then Closed

Sources

• Splunk Docs — About the Search app (index=_internal in the Search bar; Time range picker; event count; Hosts / Sources / Sourcetypes)
• Splunk Help — About the Search app (9.3)
• Splunk Docs — Start searching
• Splunk Docs — Specify time ranges (earliest / latest)
• Splunk Help — How time zones are processed by the Splunk platform
• Splunk Help — I can’t find my data! (time range may exclude events; search All time)
• Splunk Docs — About indexes and indexers
• Splunk Docs — Create custom indexes (Settings → Indexes)
• Splunk Docs — About default fields (host, source, sourcetype, timestamp)
• Splunk Docs — Why source types matter
• Splunk Docs — Index time versus search time
• Splunk Docs — tstats (index-time fields; latest(_time))
• Splunk Docs — About the Monitoring Console
• Splunk Docs — Indexing: Performance
• Splunk Docs — Indexing: Indexes and Volumes
• Splunk Docs — Forwarders (Monitoring Console) (Status active / missing; 15-minute lookback; Forwarders → TCP Input → Indexing)
• Splunk Docs — Configure forwarder monitoring
• Splunk Docs — Event indexing delay (_indextime-_time; internal logs delayed ⇒ forwarding)
• Splunk Docs — What Splunk software logs about itself
• Splunk Help — About metrics.log
• Splunk Docs — Troubleshoot forwarder/receiver connection
• Splunk Docs — Overview of Incident Review (Owner, Status, Urgency)
• Splunk Help — Take action on a notable on Incident Review
• Splunk Splexicon — Notable event
• Splunk Splexicon — Monitoring Console

Related: Blog 1 · Splunk search factory · ES notables & CIM · SPL search · Forwarders & clustering · Splunk practice hub