fix(telemetry): dedupe plugin_loaded event to once per UTC day

The plugin_loaded event was emitted on every plugin reload, generating
high event volume on PostHog (proportional to opencode restarts per
user per day). With MAU > 60K and active power users restarting
frequently, this drove unnecessary event spend.

Add a separate daily dedup state field (lastPluginLoadedDayUTC) so the
plugin_loaded capture only fires once per UTC day per machine. The
existing daily activity dedup (lastActiveDayUTC, used by
omo_daily_active) is preserved as an independent gate so the two
dimensions cannot overwrite each other in the activity state file.

src/index.telemetry.test.ts

@@ -104,6 +104,12 @@ function installModuleMocks(): void {
     createPluginPostHog: mockCreatePluginPostHog,
     getPostHogDistinctId: mockGetPostHogDistinctId,
   }))
+  mock.module("./shared/posthog-activity-state", () => ({
+    getPluginLoadedCaptureState: () => ({
+      dayUTC: "2026-04-18",
+      capturePluginLoaded: true,
+    }),
+  }))
 }
 
 describe("oh-my-openagent telemetry isolation", () => {

src/index.ts

@@ -18,6 +18,7 @@ import { installAgentSortShim } from "./shared/agent-sort-shim"
 import { detectExternalSkillPlugin, getSkillPluginConflictWarning } from "./shared/external-plugin-detector"
 import { startBackgroundCheck as startTmuxCheck } from "./tools/interactive-bash"
 import { createPluginPostHog, getPostHogDistinctId } from "./shared/posthog"
+import { getPluginLoadedCaptureState } from "./shared/posthog-activity-state"
 
 const serverPlugin: Plugin = async (input, _options): Promise<Hooks> => {
   installAgentSortShim()
@@ -43,19 +44,27 @@ const serverPlugin: Plugin = async (input, _options): Promise<Hooks> => {
   } catch {
     // telemetry failure is non-fatal, silently ignore
   }
+  let pluginLoadedCaptureState: ReturnType<typeof getPluginLoadedCaptureState> | null = null
   try {
-    posthog.capture({
-      distinctId,
-      event: "plugin_loaded",
-      properties: {
-        entry_point: "plugin",
-        has_openclaw: !!pluginConfig.openclaw,
-        tmux_enabled: isTmuxIntegrationEnabled(pluginConfig),
-      },
-    })
+    pluginLoadedCaptureState = getPluginLoadedCaptureState()
   } catch {
     // telemetry failure is non-fatal, silently ignore
   }
+  if (pluginLoadedCaptureState?.capturePluginLoaded) {
+    try {
+      posthog.capture({
+        distinctId,
+        event: "plugin_loaded",
+        properties: {
+          entry_point: "plugin",
+          has_openclaw: !!pluginConfig.openclaw,
+          tmux_enabled: isTmuxIntegrationEnabled(pluginConfig),
+        },
+      })
+    } catch {
+      // telemetry failure is non-fatal, silently ignore
+    }
+  }
   if (pluginConfig.openclaw) {
     await initializeOpenClaw(pluginConfig.openclaw)
   }

src/shared/posthog-activity-state.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it } from "bun:test"
-import { mkdirSync, rmSync, writeFileSync } from "node:fs"
+import { mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs"
 import { join } from "node:path"
 import { tmpdir } from "node:os"
 
@@ -137,4 +137,159 @@ describe("getPostHogActivityCaptureState", () => {
 
     rmSync(dataHomePath, { recursive: true, force: true })
   })
+
+  it("preserves lastPluginLoadedDayUTC when writing lastActiveDayUTC", async () => {
+    // given
+    const dataHomePath = createDataHomePath()
+    const cachePath = join(dataHomePath, "oh-my-opencode")
+    mkdirSync(cachePath, { recursive: true })
+    writeFileSync(
+      join(cachePath, "posthog-activity.json"),
+      `${JSON.stringify({
+        lastActiveDayUTC: "2026-04-10",
+        lastPluginLoadedDayUTC: "2026-04-11",
+      })}\n`,
+    )
+    process.env.XDG_DATA_HOME = dataHomePath
+    const { getPostHogActivityCaptureState } = await importPostHogActivityStateModule()
+
+    // when
+    getPostHogActivityCaptureState(new Date("2026-04-11T10:15:00.000Z"))
+
+    // then
+    const persistedState = JSON.parse(
+      readFileSync(join(cachePath, "posthog-activity.json"), "utf-8"),
+    )
+    expect(persistedState).toEqual({
+      lastActiveDayUTC: "2026-04-11",
+      lastPluginLoadedDayUTC: "2026-04-11",
+    })
+
+    rmSync(dataHomePath, { recursive: true, force: true })
+  })
+})
+
+describe("getPluginLoadedCaptureState", () => {
+  it("returns capturePluginLoaded=true when activity file does not exist", async () => {
+    // given
+    const dataHomePath = createDataHomePath()
+    process.env.XDG_DATA_HOME = dataHomePath
+    const { getPluginLoadedCaptureState } = await importPostHogActivityStateModule()
+
+    // when
+    const result = getPluginLoadedCaptureState(new Date("2026-04-11T10:15:00.000Z"))
+
+    // then
+    expect(result).toEqual({
+      dayUTC: "2026-04-11",
+      capturePluginLoaded: true,
+    })
+
+    rmSync(dataHomePath, { recursive: true, force: true })
+  })
+
+  it("returns capturePluginLoaded=false when lastPluginLoadedDayUTC matches today", async () => {
+    // given
+    const dataHomePath = createDataHomePath()
+    const cachePath = join(dataHomePath, "oh-my-opencode")
+    mkdirSync(cachePath, { recursive: true })
+    writeFileSync(
+      join(cachePath, "posthog-activity.json"),
+      `${JSON.stringify({
+        lastPluginLoadedDayUTC: "2026-04-11",
+      })}\n`,
+    )
+    process.env.XDG_DATA_HOME = dataHomePath
+    const { getPluginLoadedCaptureState } = await importPostHogActivityStateModule()
+
+    // when
+    const result = getPluginLoadedCaptureState(new Date("2026-04-11T10:15:00.000Z"))
+
+    // then
+    expect(result).toEqual({
+      dayUTC: "2026-04-11",
+      capturePluginLoaded: false,
+    })
+
+    rmSync(dataHomePath, { recursive: true, force: true })
+  })
+
+  it("returns capturePluginLoaded=true when lastPluginLoadedDayUTC is from a previous day", async () => {
+    // given
+    const dataHomePath = createDataHomePath()
+    const cachePath = join(dataHomePath, "oh-my-opencode")
+    mkdirSync(cachePath, { recursive: true })
+    writeFileSync(
+      join(cachePath, "posthog-activity.json"),
+      `${JSON.stringify({
+        lastPluginLoadedDayUTC: "2026-04-10",
+      })}\n`,
+    )
+    process.env.XDG_DATA_HOME = dataHomePath
+    const { getPluginLoadedCaptureState } = await importPostHogActivityStateModule()
+
+    // when
+    const result = getPluginLoadedCaptureState(new Date("2026-04-11T10:15:00.000Z"))
+
+    // then
+    expect(result).toEqual({
+      dayUTC: "2026-04-11",
+      capturePluginLoaded: true,
+    })
+
+    rmSync(dataHomePath, { recursive: true, force: true })
+  })
+
+  it("preserves lastActiveDayUTC when writing lastPluginLoadedDayUTC", async () => {
+    // given
+    const dataHomePath = createDataHomePath()
+    const cachePath = join(dataHomePath, "oh-my-opencode")
+    mkdirSync(cachePath, { recursive: true })
+    writeFileSync(
+      join(cachePath, "posthog-activity.json"),
+      `${JSON.stringify({
+        lastActiveDayUTC: "2026-04-11",
+        lastPluginLoadedDayUTC: "2026-04-10",
+      })}\n`,
+    )
+    process.env.XDG_DATA_HOME = dataHomePath
+    const { getPluginLoadedCaptureState } = await importPostHogActivityStateModule()
+
+    // when
+    getPluginLoadedCaptureState(new Date("2026-04-11T10:15:00.000Z"))
+
+    // then
+    const persistedState = JSON.parse(
+      readFileSync(join(cachePath, "posthog-activity.json"), "utf-8"),
+    )
+    expect(persistedState).toEqual({
+      lastActiveDayUTC: "2026-04-11",
+      lastPluginLoadedDayUTC: "2026-04-11",
+    })
+
+    rmSync(dataHomePath, { recursive: true, force: true })
+  })
+
+  it("does not rewrite state when lastPluginLoadedDayUTC matches today", async () => {
+    // given
+    const dataHomePath = createDataHomePath()
+    const cachePath = join(dataHomePath, "oh-my-opencode")
+    mkdirSync(cachePath, { recursive: true })
+    const initialPayload = `${JSON.stringify({
+      lastActiveDayUTC: "2026-04-10",
+      lastPluginLoadedDayUTC: "2026-04-11",
+    })}\n`
+    writeFileSync(join(cachePath, "posthog-activity.json"), initialPayload)
+    process.env.XDG_DATA_HOME = dataHomePath
+    const { getPluginLoadedCaptureState } = await importPostHogActivityStateModule()
+
+    // when
+    getPluginLoadedCaptureState(new Date("2026-04-11T10:15:00.000Z"))
+
+    // then
+    const persistedPayload = readFileSync(join(cachePath, "posthog-activity.json"), "utf-8")
+    expect(persistedPayload).toBe(initialPayload)
+
+    rmSync(dataHomePath, { recursive: true, force: true })
+  })
 })

src/shared/posthog-activity-state.ts

@@ -8,6 +8,7 @@ import { writeFileAtomically } from "./write-file-atomically"
 
 type PostHogActivityState = {
   lastActiveDayUTC?: string
+  lastPluginLoadedDayUTC?: string
 }
 
 type PostHogActivityCaptureState = {
@@ -15,6 +16,11 @@ type PostHogActivityCaptureState = {
   captureDaily: boolean
 }
 
+type PluginLoadedCaptureState = {
+  dayUTC: string
+  capturePluginLoaded: boolean
+}
+
 const POSTHOG_ACTIVITY_STATE_FILE = "posthog-activity.json"
 
 function getPostHogActivityStateFilePath(): string {
@@ -73,7 +79,8 @@ export function getPostHogActivityCaptureState(now: Date = new Date()): PostHogA
 
   if (captureDaily) {
     writePostHogActivityState({
-      lastActiveDayUTC: captureDaily ? dayUTC : state.lastActiveDayUTC,
+      ...state,
+      lastActiveDayUTC: dayUTC,
     })
   }
 
@@ -82,3 +89,22 @@ export function getPostHogActivityCaptureState(now: Date = new Date()): PostHogA
     captureDaily,
   }
 }
+
+export function getPluginLoadedCaptureState(now: Date = new Date()): PluginLoadedCaptureState {
+  const state = readPostHogActivityState()
+  const dayUTC = getUtcDayString(now)
+
+  const capturePluginLoaded = state.lastPluginLoadedDayUTC !== dayUTC
+
+  if (capturePluginLoaded) {
+    writePostHogActivityState({
+      ...state,
+      lastPluginLoadedDayUTC: dayUTC,
+    })
+  }
+
+  return {
+    dayUTC,
+    capturePluginLoaded,
+  }
+}